It was 116 degrees Fahrenheit in the shade outside the new Al Janoub soccer stadium, and the air felt to air-conditioning expert Saud Ghani as if God had pointed "a giant hair dryer" at Qatar. From a report: Yet inside the open-air stadium, a cool breeze was blowing. Beneath each of the 40,000 seats, small grates adorned with Arabic-style patterns were pushing out cool air at ankle level. And since cool air sinks, waves of it rolled gently down to the grassy playing field. Vents the size of soccer balls fed more cold air onto the field. Ghani, an engineering professor at Qatar University, designed the system at Al Janoub, one of eight stadiums that the tiny but fabulously rich Qatar must get in shape for the 2022 World Cup. His breakthrough realization was that he had to cool only people, not the upper reaches of the stadium -- a graceful structure designed by the famed Zaha Hadid Architects and inspired by traditional boats known as dhows. "I don't need to cool the birds," Ghani said.

Qatar, the world's leading exporter of liquefied natural gas, may be able to cool its stadiums, but it cannot cool the entire country. Fears that the hundreds of thousands of soccer fans might wilt or even die while shuttling between stadiums and metros and hotels in the unforgiving summer heat prompted the decision to delay the World Cup by five months. It is now scheduled for November, during Qatar's milder winter. The change in the World Cup date is a symptom of a larger problem -- climate change. Already one of the hottest places on Earth, Qatar has seen average temperatures rise more than 2 degrees Celsius (3.6 F) above preindustrial times, the current international goal for limiting the damage of global warming. The 2015 Paris climate summit said it would be better to keep temperatures "well below" that, ideally to no more than 1.5 degrees Celsius (2.7 F).

[...] To survive the summer heat, Qatar not only air-conditions its soccer stadiums, but also the outdoors -- in markets, along sidewalks, even at outdoor malls so people can window shop with a cool breeze. "If you turn off air conditioners, it will be unbearable. You cannot function effectively," says Yousef al-Horr, founder of the Gulf Organization for Research and Development. Yet outdoor air conditioning is part of a vicious cycle. Carbon emissions create global warming, which creates the desire for air conditioning, which creates the need for burning fuels that emit more carbon dioxide. In Qatar, total cooling capacity is expected to nearly double from 2016 to 2030, according to the International District Cooling & Heating Conference. And it's going to get hotter.

Chad Dechow, a geneticist at Pennsylvania State University who studies dairy cows, is explaining how all of America's cows ended up so similar to each other. From a report: He brings up a website on his computer. "This is the company Select Sires," he says. It's one of just a few companies in the United States that sells semen from bulls for the purpose of artificially inseminating dairy cows. Dechow chooses the lineup of Holstein bulls. This is the breed that dominates the dairy business. They're the black-and-white animals that give a lot of milk. Dairy farmers can go to this online catalog and pick a bull, and the company will ship doses of semen to impregnate their cows. "There's one bull -- we figure he has well over a quarter-million daughters," Dechow says.

The companies rank their bulls based on how much milk their daughters have produced. Dechow picks one from the top of the list, a bull named Frazzled. "His daughters are predicted to produce 2,150 pounds more milk than daughters of the average bull," he says, reading from the website. Farmers like to buy semen from top-ranked bulls, and the companies keep breeding even better bulls, mating their top performers with the most productive cows. "They keep selecting the same families over and over again," Dechow says. A few years ago, Dechow and some of his colleagues at Penn State made a discovery that shocked a lot of people. All the Holstein bulls that farmers were using could trace their lineage back to one of just two male ancestors. "Everything goes back to two bulls born in the 1950s and 1960s," he says. "Their names were Round Oak Rag Apple Elevation and Pawnee Farm Arlinda Chief." This doesn't mean that the bulls in the catalog are genetically identical. They still had lots of different mothers, as well as grandmothers. But it does show that this system of large-scale artificial insemination, with farmers repeatedly picking top-rated bulls, has made cows more genetically similar. Meanwhile, genetic traits that existed in Holstein cows a generation ago have disappeared.

Physicists at Stockholm University and the Max Planck Institute of Physics have proposed a novel design for an "axion radio" that employs cold plasmas (gases or liquids of charged particles) to "listen" for dark matter. Their paper has been published in the journal Physical Review Letters. Ars Technica reports: "Finding the axion is a bit like tuning a radio: you have to tune your antenna until you pick up the right frequency," said co-author Alexander Millar, a postdoc at Stockholm University. "Rather than music, experimentalists would be rewarded with 'hearing' the dark matter that the Earth is traveling through." [...] According to quantum mechanics, particles can exhibit wavelike behavior as well as particle characteristics. So an axion would behave more like a wave (or wave packet) than a particle, and the size of the wave packets is inversely proportional to their mass. That means these very light particles don't necessarily need to be tiny. The downside is that they interact even more weakly with regular matter than [weakly interacting massive particles], or WIMPS, so they cannot be produced in large colliders -- one current method for detecting WIMPs.

Physicists don't know what the axion's mass might be, so there's a broad parameter space in which to search, and no single instrument can cover all of it, according to co-author Matthew Lawson, also a postdoc at Stockholm University. That's why physicists have been developing all kinds of smaller experiments for detecting axions, from atomic clocks and resonating bars, to shining lasers at walls on the off-chance a bit of dark matter seeps through the other side. Yet most instruments to date are capable of detecting axions only within a very limited mass range. [...] Lawson et al. have come up with an innovative design for a tunable plasma-based haloscope. Their proposed instrument exploits the fact that axions inside a strong magnetic field will generate their own small electric field. This in turn drives oscillations in the plasma, amplifying the signal. [...] At the moment, Lawson et al.'s design is theoretical, but several experimental groups are actively working on building prototypes. "The fact that the experimental community has latched onto this idea so quickly is very exciting and promising for building a full-scale experiment," said Millar.

XXongo writes: Sometimes it seems that all the space news focuses on SpaceX, but another private rocket company, Rocket Lab, is also making history with their bargain-basement space launcher, the Electron. The Electron booster just completed its seventh launch, this time carrying a satellite to the highest orbit yet, 1000 km. The launch carried the Astro Digital "Corvus" satellite. At $5.7 million per launch, the company is the first of many space start-ups competing for the small-satellite launch business, a market too small to be of interest to the major launch companies like SpaceX and United Launch Alliance. To lower costs further, Rocket Lab has announced its intention to make their booster reusable -- with plans to capture Electron's first stage in mid-air by helicopter.

A reader shares a report from NASA: NASA's InSight spacecraft has used its robotic arm to help its heat probe, known as "the mole," dig nearly 2 centimeters (3/4 of an inch) over the past week. While modest, the movement is significant: Designed to dig as much as 16 feet (5 meters) underground to gauge the heat escaping from the planet's interior, the mole has only managed to partially bury itself since it started hammering in February 2019. The recent movement is the result of a new strategy, arrived at after extensive testing on Earth, which found that unexpectedly strong soil is holding up the mole's progress. The mole needs friction from surrounding soil in order to move: Without it, recoil from its self-hammering action will cause it to simply bounce in place. Pressing the scoop on InSight's robotic arm against the mole, a new technique called "pinning," appears to provide the probe with the friction it needs to continue digging.

Since Oct. 8, 2019, the mole has hammered 220 times over three separate occasions. Images sent down from the spacecraft's cameras have shown the mole gradually progressing into the ground. It will take more time -- and hammering -- for the team to see how far the mole can go. Engineers continue to test what would happen if the mole were to sink beneath the reach of the robotic arm. If it stops making progress, they might scrape soil on top of the mole, adding mass to resist the mole's recoil. If no other options exist, they would consider pressing the scoop down directly on the top of the mole while trying to avoid the sensitive tether there; the tether provides power to and relays data from the instrument.

Scientists have directly observed the rocky guts of exoplanets, which are worlds from different star systems, by watching the fallout of these objects crashing into the corpses of dead stars. From a report: This mind-boggling technique has revealed that exoplanets are similar in composition to planets in our own solar system, implying that worlds like Earth may be plentiful in our galaxy, according to a study published on Thursday in Science. "It's pretty cool because this is really the only way to measure the geochemistry of exoplanetary bodies directly," said lead author Alexandra Doyle, a graduate student of geochemistry and astrochemistry at UCLA, in a phone call. Co-author Edward Young, a professor of geochemistry and cosmochemistry at UCLA, added that the study represents "the first time such an advanced way of looking at the geochemistry of these bodies has been used," in the same call.

We are living through a golden age of exoplanet discoveries. Thousands of exoplanets have been detected, including an Earth-sized world orbiting the closest star to the Sun. But it is still extremely difficult to capture details about the interior composition and dynamics of these worlds. Unlike other planetary properties such as mass or atmospheric composition, a planet's geochemistry cannot be deduced just by looking at an object passing in front of its host star. White dwarfs, as it turns out, can help plug this information gap. These objects are the remains of stars that have blown up and collapsed into tiny, dense spheres about the size of Earth (our own Sun will embark on this transition in about five billion years). The pyrotechnic deaths of these stars scramble the orbits of many objects in our solar system, such as asteroids and planets. Some of these worlds may end up hurtling toward the star's posthumous white dwarf, which tears them apart over the course of about 100,000 to one million years.

Current machine learning models aren't yet up to the task of distinguishing false news reports, two new papers by MIT researchers show. From a report: After different researchers showed that computers can convincingly generate made-up news stories without much human oversight, some experts hoped that the same machine-learning-based systems could be trained to detect such stories. But MIT doctoral student Tal Schuster's studies show that, while machines are great at detecting machine-generated text, they can't identify whether stories are true or false. Many automated fact-checking systems are trained using a database of true statements called Fact Extraction and Verification (FEVER). In one study, Schuster and team showed that machine learning-taught fact-checking systems struggled to handle negative statements ("Greg never said his car wasn't blue") even when they would know the positive statement was true ("Greg says his car is blue"). The problem, say the researchers, is that the database is filled with human bias. The people who created FEVER tended to write their false entries as negative statements and their true statements as positive statements -- so the computers learned to rate sentences with negative statements as false. That means the systems were solving a much easier problem than detecting fake news.

The Paris Zoological Park on Wednesday showcased a mysterious new organism, dubbed the "blob," that has no mouth, no stomach, no eyes, yet it can detect food and digest it. The blob also has almost 720 sexes, can move without legs or wings and heals itself in two minutes if cut in half. Reuters reports: "The blob is a living being which belongs to one of nature's mysteries," said Bruno David, director of the Paris Museum of Natural History, of which the Zoological Park is part. "It surprises us because it has no brain but is able to learn (...) and if you merge two blobs, the one that has learned will transmit its knowledge to the other," David added.

The blob was named after a 1958 science-fiction horror B-movie, starring a young Steve McQueen, in which an alien life form - The Blob - consumes everything in its path in a small Pennsylvania town. "We know for sure it is not a plant but we don't really if it's an animal or a fungus," said David. "It behaves very surprisingly for something that looks like a mushroom (...) it has the behavior of an animal, it is able to learn."

An anonymous reader quotes a report from NPR: New research shows that psilocybin might be an effective treatment for diseases such as depression and addiction. While the work is still in its early stages, there are signs that psilocybin might help addicts shake the habit by causing the brain to talk with itself in different ways. "These brain changes lead to, oftentimes, a sense of unity," says Matthew Johnson, an experimental psychologist at Johns Hopkins University. It all may sound a little "woo-woo," he admits, but it seems to be working. Early results suggest that psilocybin, coupled with therapy, may be far more effective than other treatments for smoking, such as the nicotine patch.

Psilocybin seems to work because it temporarily rewires the brain, according to Johnson. Sections that don't normally talk to each other appear to communicate more, and parts of the brain that normally do talk to each other talk less. Johnson's small initial psilocybin study was extremely promising. So now he is doing a larger, more rigorous trial comparing the nicotine patch to psilocybin. Results are still coming in, but right now, half of the people who took psilocybin are smoke-free after a year. That's about twice as effective as the patch. Nutt, who's now conducting his own follow-up trials on depression treatments, is impressed with Johnson's work. Nutt believes psilocybin potentially also could be used to treat other addictions, such as alcohol and opioids. But there are some reasons to be cautious. First of all, the amount of psilocybin Johnson administers in his trials is considered a high dose, and it's paired with months of counseling. Bad trips can be common for those using the drug for treatment of diseases, and memories and experiences brought up by the drug can be challenging and disturbing.

Second, the treatment is really expensive and the whole process takes months. Finally, not everybody should use psilocybin. People with predispositions for schizophrenia and other psychotic illnesses may be harmed by taking the drug.

SpaceX is seeking permission to launch another 30,000 low-Earth orbit (LEO) satellites for its Starlink broadband network, which would be in addition to the nearly 12,000 satellites the company already has permission to launch. But it's too early in the process to determine whether SpaceX is likely to launch most or all of the additional 30,000 satellites. Ars Technica reports: The Federal Communications Commission made the requests on SpaceX's behalf, as is standard practice, in a series of filings with the International Telecommunication Union (ITU) last week. (Here's an example of one of the filings.) The 30,000 satellites would operate "at altitudes ranging from 328 kilometers to 580 kilometers," SpaceNews reported yesterday. The filings are known as coordination requests. As SpaceNews noted, the ITU coordinates spectrum "to prevent signal interference and spectrum hogging." SpaceX's filings could help the company reserve spectrum before other operators claim it, but it's an early step in the process and doesn't commit SpaceX to launching all 30,000 satellites.

SpaceX's constellation alone would dwarf the total number of satellites orbiting Earth today. As of January 2019, about 8,950 satellites had been placed into Earth orbit since 1957, and about 5,000 of those were still in space, according to the European Space Agency (ESA). Only about 1,950 of those are still functioning. If SpaceX proceeds with the additional 30,000 satellites, it would have to seek FCC permission and provide more technical detail, including plans to minimize debris and prevent collisions. SpaceX is designing its satellites to burn up completely during atmospheric re-entry in order to prevent physical harm from falling objects.

NASA's Hubble Space Telescope has given astronomers their best look yet at an interstellar visitor -- comet 2I/Borisov -- whose speed and trajectory indicate it has come from beyond our solar system. In a press release, the space agency said: This Hubble image, taken on Oct. 12, 2019, is the sharpest view of the comet to date. Hubble reveals a central concentration of dust around the nucleus (which is too small to be seen by Hubble). Comet 2I/Borisov is only the second such interstellar object known to have passed through the solar system. In 2017, the first identified interstellar visitor, an object officially named 'Oumuamua, swung within 24 million miles of the Sun before racing out of the solar system. "Whereas 'Oumuamua appeared to be a rock, Borisov is really active, more like a normal comet. It's a puzzle why these two are so different," said David Jewitt of the University of California, Los Angeles (UCLA), leader of the Hubble team who observed the comet.

California governor Gavin Newsom signed a new law on Sunday preventing schools in the state from starting classes before 8am. Quartz reports: The law bars middle schools from starting before 8am, while high schools must wait till 8:30am to begin classes. This means that about half of California schools will need to delay their opening bell by 30 minutes or less, according to a legislative analysis (pdf), while one-quarter will need to wait an additional 31 to 60 minutes to get going. Schools have until July 1, 2022 to comply with the rule, or whenever their three-year collective bargaining agreements with employees expire -- whichever comes later. Some rural schools are exempt from the law, and the new start times do not apply to optional "zero period" classes.

The move makes California the first U.S. state to heed the call of health advocates who argue that early school start times are forcing adolescents to operate in a state of perpetual sleep deprivation. The American Academy of Pediatrics, which backed the bill, said in 2014 policy statement that getting too little sleep puts teenagers' physical and mental health at risk, as well as their academic performance. The organization cited research that shows that biological changes in puberty make it difficult for the average teenager to fall asleep before 11pm, and that teenagers need between 8.5 and 9.5 hours of sleep to function at their best. It recommended that schools adjust their schedules rather than compel students to go against their natural sleep rhythms.

An anonymous reader quotes a report from The Guardian: Boosting testosterone levels significantly improves female athletic performance, according to one of the first randomized controlled trials. The findings come as the International Association of Athletics Federations (IAAF) announced on Monday it would impose an upper limit for testosterone levels on trans female athletes competing in middle-distance events. The latest research confirmed that testosterone significantly increases endurance and lean muscle mass among young women, even when given for a relatively short period.

In the study, published in the British Journal of Sports Medicine, 48 healthy 18- to 35-year-old women were randomly assigned to 10 weeks of daily treatment with 10mg of testosterone cream or 10mg of a placebo. The scientists tested the hormone's impact on aerobic performance measured by how long the women could run on a treadmill before reaching the point of exhaustion, and leg power, muscle strength and lean muscle mass. Circulating levels of testosterone rose from 0.9 nmol/litre of blood to 4.3 nmol/L in the women given the hormone cream. This was below the recent 5 nmol/L IAAF limit and below the normal male range of 8-29 nmol/L. Running time to exhaustion increased significantly by 21.17 seconds (8.5%) in the testosterone group, compared with those given the inactive substance. The group given the hormone also had significant changes in lean muscle mass, gaining 923g vs 135g overall and 398g vs 91g in their legs. "The IAAF ruled this week that trans female athletes must keep their levels of natural testosterone below 5 nanomoles per liter of blood to compete in the female category," the report adds. "The new regulation follows a similar limit imposed on athletes with differences of sexual development (DSD), including the South African Olympic gold medallist, Caster Semenya."

Cash-strapped WeWork, the office-sharing company that is trying to negotiate a financial lifeline, has a new problem that may prove costly. From a report: It has closed about 2,300 phone booths at some of its 223 sites in the United States and Canada after it says it discovered elevated levels of formaldehyde. The company, which abandoned plans for an initial public offering last month after investors questioned its mounting losses and the way it was being run, said in an email to its tenants on Monday that the chemical could pose a cancer-risk if there is long-term exposure.

After a tenant complained of odor and eye irritation, WeWork began testing and based on the results took 1,600 phone booths out of service, the company said in the email to tenants, which it calls members. An additional 700 booths are closed while more testing is conducted, it said. All the phone booths closed were installed over the past several months, WeWork said. Bloomberg columnist Matt Levine quips: "I don't understand what is happening here. Did WeWork founder Adam Neumann disturb a mummy and trigger an ancient curse? Was a WeWork built on a haunted graveyard, unleashing powerful dark energies and also elevated levels of formaldehyde? How do you have such a relentless parade of negative financial news and then find out that your phone booths cause cancer? 'Our phone booths might cause cancer' was not an IPO risk factor. Nobody had 'phone booths cause cancer' on their WeWork Disaster Bingo cards."

NASA engineer David Burns posted a paper describing the concept of his "helical engine," which could take humans to the stars by exploiting mass-altering effects known to occur at near-light speed. Unfortunately, it's been met with skepticism from those who say it violates the conservation of momentum, a core physical law. New Scientist explains: To get to grips with the principle of Burns's engine, picture a box on a frictionless surface. Inside that box is a rod, along which a ring can slide. If a spring inside the box gives the ring a push, the ring will slide along the rod one way while the box will recoil in the other. When the ring reaches the end of the box, it will bounce backwards, and the box's recoil direction will switch too. This is action-reaction -- also known as Newton's third law of motion -- and in normal circumstances, it restricts the box to wiggling back and forth. But, Burns asks, what if the ring's mass is much greater when it slides in one direction than the other? Then it would give the box a greater kick at one end than the other. Action would exceed reaction and the box would accelerate forwards.

Martin Tajmar at the Dresden University of Technology in Germany, who has performed tests on the EM Drive, believes the helical engine will probably suffer the same problem. "All inertial propulsion systems -- to my knowledge -- never worked in a friction-free environment," he says. This machine makes use of special relativity, unlike the others, which complicates the picture, he says, but "unfortunately there is always action-reaction." Burns has worked on his design in private, without any sponsorship from NASA, and he admits his concept is massively inefficient. However, he says there is potential to harvest much of the energy that the accelerator loses in heat and radiation. He also suggests ways that momentum could be conserved, such as in the spin of the accelerated ions. "I know that it risks being right up there with the EM drive and cold fusion," he says. "But you have to be prepared to be embarrassed. It is very difficult to invent something that is new under the sun and actually works."

A miniature gravitational wave detector under development would measure higher-frequency waves than LIGO. From a report: Within one second of the big bang, the first newborn black holes may have announced their formation with gravitational waves that stretched and squeezed the fabric of existence as they rippled outward into the expanding universe. Now researchers at Northwestern University have begun planning a tabletop-size sensor that could detect these primordial howls for the first time. The gigantic $1-billion Laser Interferometer Gravitational-Wave Observatory (LIGO) first measured the spacetime ripples known as gravitational waves in 2016; these phenomena came from the collision and merging of distant supermassive black holes. Since then, massive detectors have also recorded gravitational waves from merging neutron stars. Northwestern's proposed mini detector, which received an influx of funding in July, could measure higher-frequency waves from objects that have never been measured before -- such as black holes in the earliest universe.

Current gravitational-wave detectors such as U.S.-based LIGO and Europe's Virgo use a sprawling system of mirrors and laser "arms" that stretch for kilometers to measure tiny changes in distance caused by passing gravitational waves. Northwestern's Levitated Sensor Detector would use lasers to suspend a glass bead inside a vacuum chamber, creating an extremely force-sensitive sensor with arms just a meter long. It would listen for echoes from the formation of primordial black holes and the activity of theoretical particles called axions, both of which are candidates for mysterious dark matter -- hidden materials that may constitute much of the universe's mass and are invisible except for their gravitational presence.

Scientists have uncovered a glitch in a piece of code that could have yielded incorrect results in over 100 published studies that cited the original paper. From a report: The glitch caused results of a common chemistry computation to vary depending on the operating system used, causing discrepancies among Mac, Windows, and Linux systems. The researchers published the revelation and a debugged version of the script, which amounts to roughly 1,000 lines of code, last week in the journal Organic Letters. "This simple glitch in the original script calls into question the conclusions of a significant number of papers on a wide range of topics in a way that cannot be easily resolved from published information because the operating system is rarely mentioned," the new paper reads. "Authors who used these scripts should certainly double-check their results and any relevant conclusions using the modified scripts in the [supplementary information]." Yuheng Luo, a graduate student at the University of Hawai'i at Manoa, discovered the glitch this summer when he was verifying the results of research conducted by chemistry professor Philip Williams on cyanobacteria. The aim of the project was to "try to find compounds that are effective against cancer," Williams said.

"A consultant for NASA slammed the agency for deliberately ignoring the results of the experiment he handled that showed signs of alien life on Mars," reports the International Business Times. "According to the consultant, NASA refuses to conduct new life-detection tests on the Red Planet." Engineer Gilbert Levin served as a principal investigator on NASA's Viking missions, which sent two identical landers to Mars. For his role, Levin handled the missions' biological experiments known as Labeled Release (LR). These experiments focused on identifying living microorganisms on Mars. The experiments were sent to the Red Planet through the Viking 1 and Viking 2 missions in 1975....

"As the experiment progressed, a total of four positive results, supported by five varied controls, streamed down from the twin Viking spacecraft landed some 4,000 miles apart," Levin wrote in Scientific American. "The data curves signaled the detection of microbial respiration on the Red Planet," he continued. "The curves from Mars were similar to those produced by LR tests of soils on Earth. It seemed we had answered that ultimate question."

Despite the results of the LR experiment, the findings were discarded by NASA due to the agency's previous experiment on Mars.
More from Levin's article in Scientific American: Life on Mars seemed a long shot. On the other hand, it would take a near miracle for Mars to be sterile. NASA scientist Chris McKay once said that Mars and Earth have been "swapping spit" for billions of years, meaning that, when either planet is hit by comets or large meteorites, some ejecta shoot into space. A tiny fraction of this material eventually lands on the other planet, perhaps infecting it with microbiological hitch-hikers.

dryriver writes: A study in the British Medical Journal that looked at 24 of the 100s of Medical apps available on Google Play found that 79% pass all sorts of user info -- including sensitive medical info like what your reported symptoms are and what medications you are taking in some cases -- on to third and fourth parties. A German-made and apparently very popular medical app named Ada was found to share user data with trackers like Facebook, Adjust and Amplitude for example. [Click here for the article in German.] The New York Times also warned recently about apps that want to retrieve/store your medical records.

From the conclusion of the study: "19/24 (79%) of sampled apps shared user data. 55 unique entities, owned by 46 parent companies, received or processed app user data, including developers and parent companies (first parties) and service providers (third parties). 18 (33%) provided infrastructure related services such as cloud services. 37 (67%) provided services related to the collection and analysis of user data, including analytics or advertising, suggesting heightened privacy risks. Network analysis revealed that first and third parties received a median of 3 (interquartile range 1-6, range 1-24) unique transmissions of user data. Third parties advertised the ability to share user data with 216 "fourth parties"; within this network (n=237), entities had access to a median of 3 (interquartile range 1-11, range 1-140) unique transmissions of user data. Several companies occupied central positions within the network with the ability to aggregate and re-identify user data."

"In a widely-reprinted essay, Ohio State University assistant professor of physics Chris Orban ponders whether the tech world did students a favor or disservice by getting states to count computer science as high school math credit," writes long-time Slashdot reader theodp.

The assistant physics professor writes: In 2013, a who's who of the tech world came together to launch a new nonprofit called Code.org. The purpose of the organization was to get more computer science into schools. Billionaires like Mark Zuckerberg and Bill Gates donated millions of dollars to the group. According to the organization's last annual report...$6.9 million went to advocate for state legislation across the country. As part of the organization's mission to "make computer science count" in K-12 education, code.org takes credit for having influenced graduation policies in 42 states. Today, 47 states and the District of Columbia allow computer science classes to count in place of math classes like Algebra 2.

Prior to the organization's work, only a few states allowed computer science to count for math credit. In addition, 29 states passed legislation allowing computer science to count in place of a science course. When computer science begins to count as math or science, it makes sense to ask if these changes are helping America's students or hurting them...

I worry that students may take computer science just to avoid the more difficult math and science courses they need for college. Computer science could be a way for students to circumvent graduation requirements while adults look the other way....

Computer science advocates have created a kind of national experiment. The next few years will show if this was a good idea, but only if we're looking at more than just the numbers of students taking computer science.