WATER BEARS IN SPACE! The water bear, or TARDIGRADE, is so small it measures in angstroms, not millimeters. The Swedes sent some into space in The tiny critters survived the vacuum of space, the intense cold and radiation for 8 days!
frontal-cortex: Scanning electron microscope picture of a nerve ending that has been broken open to reveal the synaptic vesicles beneath the cell membrane. Image by Tina Carvalho. The Cell: An Image Library