No prizes for guessing the first thing you'll need: a microscope. But don't worry if you don't have one of your own. Ask your school if they have one you can use. Then you'll need an onion.

Some of the microscopes on this list are for the very smallest of children, designed to be toys but with working microscope functions ... is generally simpler to use and less expensive than ...

With an abundance of advanced features, the CB2000C trinocular microscope by Celestron Labs is ideal for enthusiasts with little experience.