Astrophysicist Neil deGrasse Tyson says his Christmas tweet about Isaac Newton shouldn't be interpreted to mean he's anti-Christian.
Tyson, who will host a new late-night talk show on the National Geographic Channel starting in April, attracted attention for tweeting on Dec. 25: "On this day long ago, a child was born who, by age 30, would transform the world. Happy Birthday Isaac Newton b. Dec. 25, 1642."
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