Array tomography is a state-of-the-art imaging system invented by Stanford University researchers. It allows researchers to count the myriad connections between nerve cells, as well as to catalog those connections’ surprising variety.

A typical healthy human brain contains about 200 billion nerve cells, or neurons, linked to one another via hundreds of trillions of tiny

When a head is twisted violently, such as in a car crash, microscopic brain structures, called axons, can tear.  The damage to the brain is a called a "diffuse axonal injury," or DAI.  When the axons tear, chemicals that were contained in those structures can leak into the brain tissue.  The torn axons and chemicals in the brain tissue

An impact on one side of the head can cause the pudding-like substance of the brain to hit the inside of the skull and then bounce back and hit the inside of the skull on the opposite side of the head.  When the brain suffers two injuries from one impact, it is called a