Conservation of energy isn’t just a good idea: It is the law. In particular, it is the first law of thermodynamics. But ...

A machine that can push itself through space without expelling any propellant has long been a holy grail for engineers and dreamers.

Experts have theorized that UFOs appear to defy the laws of physics potentially thanks to an anti-gravity machine, and that as a ...

A wheel weighted with swinging mallets. A cylinder rotating in a sealed, water-filled container. A siphon that transfers liquid ...