by xkcd's What If? | Aug 5, 2026 | Air Vehicles, Body Vehicles
Get a copy of What If? 2 and Randall’s other books at: https://xkcd.com/books More serious answers to absurd questions at: https://what-if.xkcd.com/ This question comes from Rob, who asks: is it possible to build a jetpack using downward firing rifles? I was sort of...
