How do the cells in a human embryo know where they are located in the body and how they should develop? Why do certain cells form a finger while others do not? Biologists have explained the mechanisms ...

A stressful year leads to anxiety. Lasting isolation gives way to depression. An old trauma nags until it becomes paralyzing.

If we can fully map the structure of our brains, will we be able to understand how they work? That is the goal of researchers attempting to build a wiring diagram, or connectome, of our neural ...