Maybe we saw The Andromeda Strain a few too many times in our formative years, but we can´t help shivering when we hear about microbiologists reanimating long-dormant lethal viruses. And those biologists working to make human limbs grow back: Haven´t we seen that film?

The Bubbling Cauldron

Want a real witches´ brew? Mix soap-bubble solution with dry ice, or use liquid nitrogen for bubbles that release fog when they pop. In the following video, PopSci´s contributing mad scientist, Theodore Gray, uses the help of a few young assistants to create cauldrons of toil and trouble.

Here´s how it´s done: