Learn how humans begin life as a single cell and, over the course of a lifetime, grow into beings of more than 37 trillion cells. Plus, explore new discoveries that can help humans live longer, healthier lives.

Discover the miracles the human body goes through every day to stay alive and healthy. From fighting infections to repairing damage, human bodies have remarkable arsenals that allow survival against all kinds of outside threats.

See how experience shapes the brain and body together, allowing them to adapt to the outside environment and develop new skills. Plus, learn how the brain forms memories by storing and processing billions of pieces of information every second.