Studies have found that loneliness can increase the risk of early death as much as smoking 15 cigarettes a day - and may be more harmful than obesity.

Ravens and wolves have been observed working together to find food, with ravens acting as scouts. When they locate a carcass, they alert the wolf pack with a special call, allowing both species to benefit from the find.

A 2019 survey found that 45% of Americans believe in ghosts and demons, with over a third reporting they've felt the presence of a ghost or spirit.

The average person consumes roughly 20 lbs (9 kg) of onions per year. That's around 80 onions.

Alcohol is the leading global risk factor for premature death and disability among adults under 49 years old, causing more deaths than malaria, tuberculosis, and violence combined.

The most efficient walking speed for humans is 3.5 mph (5.6 km/h), meaning you travel the furthest per unit of energy used at this speed.

It is estimated that there are over 3 million undiscovered shipwrecks in the world's oceans.