Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
The average home creates more pollution than does the average car.
33
Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
16
Pure water (H2O) does not conduct electricity on its own.
46
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Most dust particles in your house come from dead skin.
48
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