These animals hit their prime in their 80s; the best aurora season; finding the real Jesus

Also, the Viking king behind 'Bluetooth'; how the parents of Jesus met; masters of ‘microsleeps’; castor oil

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ENDS TONIGHT: Save 25% on Nat Geo History! Just $29/yr (6 issues + FREE bonus issue!)

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What is frozen shoulder? If you're a woman, you're at risk

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Helping kids help animals, holiday crafts for the family, and a belly-button quiz

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The real ‘Murder at the End of the World’; what disease is striking American dogs?

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How to live better, not just longer? W-A-L-K. Plus, ways to ease anxiety; an animal that gets better with age

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