Here's a way of looking at the origin of life through logic: 1. Must have variations to select from. 2. The variations must be as a reaction to a heat cycle in the environment. If not then the environment would either a. continue getting hotter and hotter until all is literally burnt up. b. continue getting colder and colder till all is inert. 3. The heat cycle must be reasonably consistent or there would be nothing to adapt to a. IF completely random - no chemical system can adapt b. IF completely unrandom - sooner or later no variants are produced. 4. The Sun heat cycle seems to be the only heat cycle or force that fits: a. gravity - a virtual constant (and very little force on molecules so small. b pH - mostly constant - seldom cyclical b. thermal vents - heat cycle - but too changeable due to techtonic plates c. lightning - unconstant heat/power source d. radiation from the earth - constant power source. e. tides - reasonably constant and cyclical but unstable and much less stable than sun cycle. Early earth was faced with only one cyclic heat source of consequence. It was the force that any chemical system had to adapt to to exist. It was also the force that kept the earth in the liquid water zone. Comment?