"Numbers are a human invention, and they’re not something we get automatically from nature," says Caleb Everett. Kwangmoozaa/iStock Once you learn numbers, it’s hard to unwrap your brain from their ...

Dog lovers know: All dogs are very good boys and girls. But our favorite canine companions are often painted as dopey — lovably so — and unintelligent. But a new study suggests it is high time to ...