
Quick Look
Dino Wars
By Brent Reilly
If the asteroid that killed dinosaurs, 65 million years ago, had been half as big, only dinos in the Americas would have died. Mammals would have evolved without dinos on South America Island until a land bridge connected it with North America, 3 million years ago. The smartest raptor, troodon, grew twice as big above the Arctic Circle because harsh conditions rewarded intelligence.
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