Gallium – the dream of every high-school chemistry prankster. Of course, 45 years after my last high-school chem class, someone has monetized that space:

As a kid, I often coated silver coins with mercury (if you have any questions about why my brain works the way it does, you can point the finger of blame right there.) They became shiny like proof coins, and felt slick to the touch. Unfortunately, the shininess didn’t last, and as the coins oxidized, they took on a dull matte finish. Even more interesting, however, is some real chemistry with gallium, and watching it infiltrate the crystal structure of an aluminum can is intriguing.

To paraphrase Will Hunting, a lot of people are dropping a hundred grand on an education you can get for the price of a decent internet connection.

The Old Wolf has spoken.