Barotrauma can cause a fish's eyes to pop out of its head and its stomach to be pushed out of its mouth, according to Chris Lowe, a marine scientist at California State, Long Beach.
In sighted people, the part of the brain that recognizes faces is linked to the brain's visual system. But in blind people it seems wired to circuits that process sound.
Tina Zellmer/Ikon Images/Corbis
A tangle of protein (green) in this scanning electron micrograph of a brain cell of an Alzheimer's patient lies within the cytoplasm (blue) of the cell. The tangle consists of clumps of a toxic form of tau.
Thomas J. Deerinck/Corbis