Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
A third of the human population sneezes when they look at the Sun. Light can signal the ocular nerve near the sinuses and triggers a sneeze.
18
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
Your heart will pump about 212 million liters in its lifetime.
26