This animation describes how skin color is generated by skin cells as protection against ultraviolet (UV) radiation.

This animation zooms into a coral reef to explore the tiny animals that build reefs, the photosynthetic algae inside their cells, and the damaging process of coral bleaching.

This animation shows how disrupting cellular processes in the intestines can lead to colon cancer.

This animation shows how neurons send and receive signals to communicate with one another at contact points called synapses.

This animation shows how a tumor forms, recruits blood vessels, and enters metastasis.

This animation shows how meiosis, the form of cell division unique to egg and sperm production, can give rise to sperm that carry either an X or a Y chromosome.