Neutrinos have almost no mass and interact so weakly that billions pass through your body every second.

The human stomach can expand significantly after a large meal.

Fact #101 · Human Body

The human skeleton renews itself over time.

Fact #133 · Human Body

Some animals sleep for years.

Fact #1720 · Human Body

Operation Mongoose aimed to destabilize Cuba in the early 1960s.

Fact #1069 · Human Body

Vaccines train the immune system to recognize pathogens.

Fact #64 · Human Body

The primacy effect describes better recall of early information in a sequence.

Fact #1477 · Human Body

A grizzly bear can run surprisingly fast over short distances.

Fact #492 · Human Body

Practice can strengthen neural pathways in the brain.

Fact #968 · Human Body