What are some mind-blowing technologies that exist that most people don't know about? by Alex Arthurs
Answer by Alex Arthurs:
One amazing material that not many people know about is called aerogel. Aerogel is basically any gel where the liquid component in the gel is replaced with a gas. Basically a molecular sponge.
This makes the gel very, very, very light. Barely heavier than air. It looks like frozen smoke and is bluish and transparent. It has so little thermal conductivity that a fairly thin sheet of it will protect you from a sustained blast from a flamethrower.