In the physical sciences, non-life is an umbrella term set to distinguish or characterize those inanimate chemical precursors found in the primeval soup of the early years of planetary evolution from which life, theoretically, evolved or came into existence. In the classic 1953 Urey-Miller experiment, for example, non-living chemical entities such as water (H2O), methane (CH4), ammonia (NH3) and hydrogen (H2) were electrically stimulated, using sparks as simulating lightning, into forming the va… (More on Non-life)