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
I have my faults, but changing my tune is not one of them...Critics have a responsibility to put things...Optimism is the faith that leads to achievement...A round man cannot be expected to fit in a square hole...I was a pretty good fighter...The common idea that success spoils people...
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