The Basenji dog is the only dog that is not able to bark.
4
In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
81
If two pieces of metal touch in space, they become permanently stuck together.
808
Held in farts enter your bloodstream and are bad for your body.
26
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
In one day, adult lungs move about 10,000 litres of air.
11