An argument often given for why Earth couldn't host another form of life is that once the life we know became established, it would have eliminated any competition through natural selection. But if another form of life were confined to its own niche, there would be little direct competition with reg
“New York is an exciting town where something is happening all the time, most unsolved.”
“Being over seventy is like being engaged in a war. All our friends are going or gone and we survive amongst the dead and the dying as on a battlefield.”