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
Since the global financial crisis and recession...I love being busy, and I love having a lot going on...Perseverance, secret of all triumphs...Our criminal justice system is fallible...Millions don't rally to the banner of Uncertainty...Nevertheless he is the only one of them...
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