In this clip, Charlie tries to identify a crimal via the car keys in her purse. Car keys use a mathematical algorithm to send a different n digit number each time the button is pressed, which the locking mechanism can identify as right or wrong.

Homer evolves from a single-celled organism into a modern-day human. A great depiction of evolution.

Although science has not fully explained the origins of life, this clip describes how basic chemistry gave rise to living organisms.

Hank provides background information on the biologist who contributed to evolutionary history: Charles Darwin. He also explains the four principles of Darwin's idea of natural selection, which are variation, heritability, struggle for existence, and survival and reproduction rates. Key Words: Genetic Drift, Fitness, Variations of Phenotype, Heritable, The Struggle for Existence, Survival and Reproduction Rates

In this clip, Charlie is trying to crack a code a man has left him.