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
Strike while the iron is hot...There is nothing wrong with America that cannot be...Music can change the world...I think it's an enormous blessing to be the child...Life's tragedy is that we get old too soon...Traditions are our roots and a profile of who we are...
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