The cat-eye polish trend is subtle but so fun to look at. The only downside is that you typically need gel polish to achieve ...

We are fascinated by the hybrid rocket engine which [Ben Krasnow] built and tested in his shop. It is actually using a hollow cylinder of acrylic as the fuel, with gaseous oxygen as an oxidizer.

and even hybrid rocket engines are becoming passé. We’ve never seen a liquid-fuel rocket build before, so that’s what this roundup evolved into. First up is [Robert Watzlavick], who has been ...

While many scientists are looking into theoretical space engines, others are focusing on the tried and true—such as plain old-fashioned engines that burn rocket fuel. In this new study ...