If you are locked in a completely sealed room, you will die of carbon dioxide poisoning before you will die of oxygen deprivation. See more

A 'jiffy' is an actual unit of time for 1/100th of a second. See more

Wearing headphones for just one hour will multiply the number of bacteria in your ear 700 times. See more

More than 50% of the people in the world have never made or received a telephone call. See more

Hydrogen is an explosive gas. Oxygen supports combustion. Yet when these are combined it is water which is used to put out fires. See more

All the chemicals in the human body have a combined value of approximately £4.00. See more

Mexico City sinks about 10 inches a year. See more

The average person falls asleep in seven minutes. See more

Leonardo Da Vinci invented the scissors. See more

If you fart constantly for 6 years and 9 months, enough gas is produced to create the energy of an atomic bomb. See more

Most dust particles in a US house are made from dead skin. See more

Your system of blood vessels is over 60,000 miles long. That's long enough to go around the world more than twice! See more

The heart beats about 100,000 times each day. See more

Blood is about 78 percent water. See more

Those stars and colours you see when you rub your eyes are called phosphenes. See more

The thumbnail grows the slowest; the middle nail grows the fastest. See more