We already know the great things that can happen with water repelling magic, but the folks over at Adafruit took it a step further and risked a little electrocution. But the result, submersible circuit boards, is definitely cool enough to be worth the trouble.
The wonderful promise or waterproof everything has been around for ages, but it's crazy to see it finally showing up in DIY form. You might be hard pressed to find a good reason to have a Raspberry Pi mounted in a fish tank, but you can't deny that it's pretty damn cool. Though maybe you could argue it's a little dry. [Adafruit via Make]