An anonymous reader writes: McDonald's has hired the creators of Google's Project Ara to reinvent the drinking straw. Their new invention, the "Suction Tube for Reverse Axial Withdrawal" (STRAW for short), is a J-shaped device that allows the user to drink both layers of the company's dual-layer Chocolate Shamrock shake simultaneously, receiving an optimal mixture of chocolate and, um, shamrock. McDonald's announced the new product at a Facebook live event yesterday, which included a keynote by McDonald's Senior Director of Menu Innovation Darci Forrest, a Silicon-Valley-style panel moderated by Austin Evans, and interviews with engineers from NK Labs and JACE. Computational fluid dynamics simulations, 3D printing, and extensive real-world testing (drinking shakes) were required to get the design ready for its eventual unveiling. McDonald's is producing a limited first run of 2000 of the straws for distribution at restaurants across the U.S. "My first reaction was, that doesn't seem too hard. We could have a double straw -- one longer, one shorter. No problem," says Seth Newburg, principal engineer and managing partner at NK Labs, which teamed up with JACE Design on the STRAW. "Then we immediately thought, once you get halfway down, one straw is going to start sucking air... It's one of those things that seems so simple, but as we got into it there were a lot more issues exposed. It turned out to present quite a few engineering and scientific challenges." NK Labs and JACE Design were the two companies who also worked on Project Ara together, the Google initiative to build a phone with interchangeable modules for various components like cameras and batteries. Unfortunately, the plans for Project Ara were scrapped late last year.