Jan Hoole/The Conversation

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Is your dog actually smart? Depends on its memory.

Is your dog actually smart? Depends on its memory.

Four-legged whales once straddled land and sea

Four-legged whales once straddled land and sea

Sloths aren't the picky eaters we thought they were

Sloths aren't the picky eaters we thought they were

Scientists are trying to figure out where the heck horses came from

Scientists are trying to figure out where the heck horses came from