In this quick classroom challenge, I put three mystery animal specimens under my digital microscope and let you guess what they are. The only hint I give is that they all start with the letter S.

Explore beach water under the microscope and discover how much life it contains.

An image of the coral Stylophora pistillata taken with the new micrsope, BUMP. Each polyp has a mouth and a set of tentacles, and the red dots are individual microalgae residing inside the coral ...