Eco-friendly alternatives to fossil fuels are venturing beyond Earth—and into space.

This water rocket launcher lets you do just that ... If you’ve already got a compressor and some empty 2-liter bottles you might also pick up some extra PVC to make this pressurized water ...

Usually, this takes the form of a 2-liter bottle ... pad for STEM students and their water rockets. Of course, [Colin Furze] gets a shout-out for his jet-powered go-kart. Thank you, [Itay ...