In 1953 Stanley Miller an
experimental apparatus that
the atmospheric conditions of
primitive earth. The experiment
a mixture of methane,
, hydrogen and circulating
water when heated was
transformed vapor. He submitted
the to continuous bombardment
of discharge and after days
a liquid residual within
he discovered organic molecules
among them surprisingly the
acids glycine and alanine, most
abundant constituents of . Other
researchers reproduced the
experiment and noted also
formation of other organic
such as lipids, carbohydrates
nucleotides.