Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Nearly 50% of the world's scientists are assigned to military projects.
71
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
4.5 pounds of sunlight strike the Earth each day.
27
If the chemical sodium is dropped into water it will immediately and violently explode.
67
A ball of glass will bounce higher than a ball made of rubber.
73
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