If you've ever marvelled at a rainbow, you have witnessed dispersion in action!
Fully functioning invisibility cloaks are closer to becoming a reality than you might think. Here's a quick look at the maths and science involved in producing them.
People have been using gold particles dispersed in water — gold hydrosols — for medical purposes for over 1000 years. Recently, hydrosols containing gold nanoparticles have become particularly popular because they have exciting potential in cancer therapies, pregnancy tests and blood sugar monitoring.