11.   Until a few years ago, researchers thought that the brain got all necessary information about the direction of motion from signals received on the retina of the eyes.

12.   For one thing, their brains simply get more blood.

13.   Serotonin is made in the brain with a building block called tryptophan, which the brain gets from the bloodstream.

14.   Glutamate can kill neurons if it is released in high concentrations such as when the brain gets inadequate oxygen.