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A bus-sized dinosaur is found in Egypt and it offers a clue to an ancient mystery

Scientists have discovered a new species of dinosaur -- and it's a big deal.

First, let's talk size. The dino, Mansourasaurus shahinae, was the length of a school bus and about as heavy as an elephant, weighting in at around five tons.
That makes it a part of a group of dinosaurs known as the Titanosauria, which includes the largest land animals known to science.
But what's even more remarkable about this discovery is what it says about the evolution of dinosaurs.
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