When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Sound travels fifteen times faster through steel than through air.
134
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
At 15 years old, Jack Andraka invented a method of diagnosing pancreatic cancer, thus helping to save the lives of millions of people around the world. It is 168 times faster, 26,000 times cheaper, 400 times more sensitive, and has a 99% success rate.
15
The use of emoticons affects our corresponding brain areas and can actually trigger emotions.
21
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
The only letter not appearing on the Periodic Table is the letter "J".
180
Your brain is 80% water.
525