Science: A Bear Named Gene

In their wild state, polar bears and Alaskan brown bears do not mate. For one thing, polar bears live on arctic ice, brown bears on solid ground. They also belong to different species. So when a male polar bear cub named Snow White and a female brown bear cub named Ramona were put together in a cage at the Washington Zoo more than ten years ago, the animal experts did not expect much to happen.

But propinquity and persistence eventually triumphed over zoology. Snow White and Ramona produced two litters of cubs, four of which...

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