Cows can sleep standing up, but they can only dream lying down.
745
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court.
140
In the last 7 years, humanity has discovered 43 potentially habitable planets.
14
You forget 90% of your dreams.
256
The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
21
The largest breed of rabbit is the Flemish Giant.
65