Motion-triggered monster heads, a witches´ brew of liquid nitrogen, a projector rigged for fright, and more. Here, our favorite high-tech haunting tricks made easy
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: