Your thumb is about the same size as your nose.
124
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
Your body is creating and killing about 2.4 million red blood cells per second.
17
The oldest glowing lightbulb was first switched on in 1901 and lives in fire stations in Livermore, CA. It is known as the Centennial Light.
118
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
In the last 7 years, humanity has discovered 43 potentially habitable planets.
14