The first experimental support to Oparin-Haldanes theory of origin of life came from Urey and Stanley Millers experiment in 1953. He built an apparatus of glass tubes and flasks in the laboratory. He created an atmosphere containing hydrogen (H2), ammonia (NH3), methane (CH4) and water vapours (H2O) in one large flask and allowed condensed liquids to accumulate in another small flask. The ratio of methane, ammonia and hydrogen in large flask was 2:1:2.