The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
Scientists aren't sure what color dinosaurs were.
312
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3
In the 60s, a scientist gave LSD to dolphins in an attempt to teach them English.
17
Sound travels fifteen times faster through steel than through air.
134