Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Putting your car alarm remote under your chin or beside your head increases its range.
-1
The full moon causes a tidal wave to roll up the Amazon river once in day and once in night for a period of only three weeks in a year. This results in continuous 4m high wave that can be surfed for up to 13km.
14
All humans have the ability to see ultraviolet light, but it is passively filtered out by the eye's lens. People who undergo surgery to remove the lens can detect ultraviolet light.
21
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9