Brass doorknobs automatically disinfect themselves in about 8 hours.
18
The storage capacity of human brain exceeds 4 Terrabytes.
140
Pumice is the only rock that floats on water.
14
Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
16
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5