The human sense of touch is so sensitive that a ridge 0.006 mm high on a surface can be felt.

There are deeper mysteries.

Fact #2322 · General

The spotlight effect causes people to overestimate how much others notice them.

Fact #1486 · General

X-rays were discovered in 1895 and transformed medical imaging.

Fact #1194 · General

Çatalhöyük is one of the oldest known urban settlements.

Fact #1641 · General

The Maya city of Tikal was once a powerful urban center.

Fact #1639 · General

Some crabs can regrow lost legs.

Fact #552 · General

Some people experience time slowing during emergencies.

Fact #2285 · General

People are more likely to remember information that is emotionally charged.

Fact #943 · General