The charges of electron and proton must be equal and opposite; the neutron must outweigh the proton by a tiny percent; a matching must exist between temperature of the sun and the absorptive properties of chlorophyll before photosynthesis can occur; if the strong force were a little weaker, the sun could not generate energy by nuclear reactions, but if it were a little stronger, the fuel needed to generate energy would be violently unstable; without two separate remarkable resonances between nuclei in the cores of red giant stars, no element beyond helium could have been formed; had space been less than three dimensions, the interconnections for blood flow and the nervous system would be impossible; and if space had been more than three dimensions, planets could not orbit the sun stably.—The Symbiotic Universe, pages 256-7.
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