Because it's Friday: Gallium

I'd never really come across the element gallium before seeing the video below (except as a doping agent in superconductors). Apparently it's pretty neat stuff: kinda like mercury, except solid at room temperature but melts in warm water. And if you introduce it to other metals, like aluminium, it flows right through them, creating an alloy and weakening the structure:

 

Kinda cool.