Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Sound travels about 4 times faster in water than in air.
408
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
Hot water can freeze faster than cold water.
181
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
Scientists are now able to grow 'beating' heart tissue in a lab!
162