When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
One cubic foot of gold weighs more than 1,200 pounds!
78
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
Each day is longer than the previous on by 0.00000002 seconds which is 13 seconds each century!
116
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
For a high school science fair project, 17-year-old Michio Kaku built a particle accelerator in his parent's garage that was able to generate a magnetic field 20,000 times greater than the Earth's and produce collisions powerful enough to create antimatter.
34