Boric acid kills roaches (among other creepy-crawlies). Which is great if you want to dispose of roach carcasses and enjoy crafting little tinfoil boats and filling them with white powder, gleefully ...

Sulfur hexafluoride is one of the densest gases out there. It's so thick that it's possible to pour it into a container like a liquid and float a tinfoil boat on it. Check out the boat that floats on ...