From National Geographic:
Medical researcher Anne Weston took this photograph of a cancer cell with an electron microscope. She captured the image as the cell crept into a pore on a laboratory filter to illustrate how cancer cells move.
Cambridge University lecturer John Brackenbury combined this series of high-speed photographs to illustrate the concept of panspermia. Panspermia is the theory that seeds of life exist throughout the universe and that life on Earth arose when those seeds landed on our planet eons ago. The image shows eggs shattering as they hit water, releasing smaller eggs within.
More here.