You cannot sneeze with your eyes open. See more

The magnetic North Pole shifts by about 7 meters a day. See more

Hot water weighs less than cold water for a given volume. See more

Lightning bolts can sometimes be hotter than the sun (about 50,000 ºF, 27,760 ºC). See more

Astronauts grow taller in space. See more

Your skin weighs about 3.2 kg. See more

One quarter of the bones in your body, are in your feet. See more

The can opener was invented 48 years after cans were introduced. See more

The screwdriver was invented before the screw. See more