It's official: Science says grannies are good for you

Scientists say they have proven what many people fortunate enough to grow up with theirs have known all along: Grandmothers have strong nurturing instincts and are hard-wired to care deeply about their grandchildren.

Fossil dental exams reveal how tusks first evolved

A wide variety of animals have tusks, from elephants and walruses to five-pound, guinea pig-looking critters called hyraxes. But one thing tusked animals have in common is that they're all mammals—there are no known fish, ...

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