Sleep consolidates memories — learning just before sleep produces better retention than before wakefulness.

Some animals sleep for years.

Fact #1720 · Human Body

Hippopotamuses secrete a reddish fluid that helps protect their skin.

Fact #1246 · Human Body

Curiosity can enhance learning and memory retention.

Fact #973 · Human Body

Smiling can influence mood through feedback to the brain.

Fact #951 · Human Body

The human body contains about 206 bones.

Fact #267 · Human Body

Humans reached the Moon less than 70 years after powered flight.

Fact #1741 · Human Body

A sea anemone uses stinging cells to capture prey.

Fact #437 · Human Body

Vaccines train the immune system to recognize pathogens.

Fact #64 · Human Body