Neil deGrasse Tyson
Perhaps we've never been visited by aliens because they have looked upon Earth and decided there's no sign of intelligent life.
More quotes and aphorisms
A mountain is composed of tiny grains of earth...Laughter is the sensation of feeling good all over...All hat...Art is a critical component in a well-rounded education...I never had a policy; I have just tried to do...One of the tests of leadership is the ability to recognize...
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