It's okay not to know all the answers. It's better to admit our ignorance than to believe answers that might be wrong. Pretending to know everything closes the door to finding out what's already there.
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About Neil deGrasse Tyson
Neil deGrasse Tyson was a 20th-century American astrophysicist. Neil deGrasse Tyson is an American astrophysicist, author, and science communicator. Tyson studied at Harvard University, the University of Texas at Austin, and Columbia University. Read more on Wikipedia →