Nikon has handed out awards in its second annual Small World In Motion competition--a contest for the best video of the world we can't see with our naked eye.
Here are a few of my favorites...
A tiny animal called a rotifer lives inside a tube attached to a plant. It beats hairs called cilia to pump food into the tube, where it can be ground up by the rotifer's jaw-like structures.
Here, kidney cells grow in a dish into the distinctive branched anatomy that lets kidneys filter waste out of blood.