While the human brain makes up only 2% of total body weight, it consumes 20% of the oxygen we breathe and 20% of the energy we use.

Horseshoe crabs have bright blue blood, which is one of the most valuable liquids on Earth - used in medical testing, it can sell for around $15,000 per litre.

A recent U.S. study found that IQ scores declined in three of four cognitive domains between 2006 and 2018, with researchers suggesting smartphones are to blame.

Evel Knievel holds the world record for the most broken bones at 433 - meaning, on average, he broke every bone in his body more than twice.

Research shows that swearing can reduce the perception of pain by up to 33%, providing a measurable analgesic effect.

In 1991, a man in Pennsylvania bought a painting for $4 at a flea market and discovered an original copy of the Declaration of Independence hidden behind it. He sold it at auction for $2.2 million.

Studies have shown that rats can dream - and often dream about their future goals. In the study, their dreams involved reaching food at the end of a pathway.