For a T. rex, being smart was certainly a matter of survival. But sorry, it just ain’t so. The Margin 10 things that would happen to the planet if humans were to completely disappear Published: June 6, 2016 at 4:00 p.m. As we grew smarter, we were better able to take care of our infants, so they could be born more helpless and allow us to grow even smarter. Humans have created long-lived synthetic molecules like plastic, so maybe a hypothetical ancient lizard civilization would have as well. A video from AsapScience explores what would happen if humans suddenly disappeared from the face of the Earth (though we obviously wouldn't be around to worry about it). And so the cycle continues. The brain, therefore, must keep maturing, and the head must continue growing, long after birth. We didn’t have claws and weren’t very big and strong, instead we were smart … 85% Upvoted. Other animals didn't compete with humans in that way. 17 signs you're intelligent — even if doesn't feel like it. 1. How? Why? So while you're more likely to be a loner if you're highly intelligent, that lifestyle is less likely to make you lonely -- presumably because you're too busy building a world-changing business or curing disease to be much bothered about missing bowling night. Having a great brain is wonderful, but having to deal with everyone else's expectations of the marvelous things you'll do with that brain? Here's what scientists think—suffice it to say our modern world would probably be pretty different. 7. "More intelligent people may be more distractible at work because they have trouble prioritizing all of the great ideas they're always coming up with, according to a new study," Money said, reporting on one 2016 survey of more than 10,000 workers. But while there aren’t guide cats or police cats, there have actually been mail delivery cats! This can drive some perverse behavior in kids labeled smart. But humans, don’t resign yourselves to defeat just yet. That may not seem like such a big number, so let's look at the EQs of some other mammals: on this scale, wildebeests weigh in at .68, African elephants at .63, and opossums at .39. They probably weren’t as smart as in the movies though. Human intelligence comes with a curious caveat: our babies are among the dumbest—or, rather, the most helpless—that exist. 10. When the study participants were in their 80s, researchers asked them to look back on their lives. A fascinating recent study found that compared with the less gifted, smart people tend to spend more time alone. (Kidd also stresses repeatedly that this theory supplements, but does not supplant, earlier ones: it can coexist quite naturally with both the social-group account of intelligence—the Dunbar approach—and what’s called the metabolic accounts of intelligence, which posits that our digestive system has allowed for our brain’s high metabolic needs, and that we grew smarter to be able to find and share difficult-to-gather food.) There's a silver lining for the exceptionally smart, however. I think you greatly underestimate the amount of intelligence it takes for a feeble, blunt-toothed, slow, clumsy biped to survive in a primeval savanna. Homo sapiens didn’t make their appearance on the planet until just 300,000 years or so ago. “There were mammals alive at the same time and place as T. rex, but none very big—and for all we know, modern mammal flesh might be unpalatable,” wrote Waggoner. The more intelligent an animal will eventually be, the more relatively immature its brain is at birth. 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