Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9
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
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
Iron weighs more after it rusts.
68
Nylon is made from coal and petroleum.
42