All of these problems aren’t a concern for [Igor], who’s building what will probably end up being the world’s smallest turbojet ... from a diesel engine into a jet. The innovation here ...

One of the world’s smallest fish, measuring about half an inch long, can produce sounds as loud as fireworks or a jet engine, ...

Screenshot from social media post of Ukrainian volunteers assembling a small cruise missile with ... at a depth of up to 140 km. A pulse jet engine operates by generating thrust through a series ...