Newton's cradle has enjoyed a fantastic run as the go-to distraction toy in offices around the world. But today it's officially dethroned by this hypnotic ferrofluid flask that's basically magnetic magic in a bottle.
Usually reserved for science centre demonstrations, ferrofluid is a magnetic liquid composed of microscopic iron particles that form three dimensional shapes and patterns in the presence of a magnetic field. It's like that grade school iron filing magnetic experiment cranked to eleven. And for just $30 you can get your hands on a glob of ferrofluid sealed in a small glass bottle complete with tiny magnets for conducting your own experiments. Just don't expect to meet any deadlines or get anything done the day it arrives.