After former President Obama lit up the internet speculating that aliens probably exist, Neil deGrasse Tyson tells NBC News’ ...
Spinosaurus, the only known semiaquatic dinosaur predator, joins Tyrannosaurus, Giganotosaurus and Carcharodontosaurus among the largest meat-eating dinosaurs.
NBC News' Ellison Barber talks to MIT Professor of Nuclear Science Jacopo Buongiorno about the U.S. airlifting nuclear ...
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