Lack of water is the #1 trigger of daytime fatigue.
148
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
One human hair can support 3 ounces.
191
Pluto is smaller than Russia.
9
More people in Africa speak French than in France itself.
12
There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
15