Earth is yet young, writes British-born Christopher Potter in You Are Here. Life is young. Humanity is but one page in a saga whose final chapters are yet to be written. “Chemicals older than the sun and forged in generations of stars are brought to the earth as seeds of life,” observes Potter. These bits of debris from comets or stellar dust, called chondrites, fall to earth even now, and they provide valuable information on organic compounds that may have reached the earth billions of y...
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