About 45 nutrients are key to brain health. What must you eat to improve it? Some of these foods—oats, beans, plums—might seem counterintuitive. What else?

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With a starting bid at $10 million, whoever takes over the world’s largest rhino farm needs passion for conserving them and a hefty stream of income: Hume spends more than $425,000 per month on farm operations, Nat Geo reports. (Above, a veterinarian treats a wounded rhino, photographed by Nat Geo Explorer Brent Stirton.)

Yaks have slightly larger hearts and lungs than cattle found at lower altitudes—and these animals play a crucial role in helping people survive in harsh conditions. (Above, a villager in northern India brings his yak home from open pasture.)

Male calves are often abandoned by farmers, but they can’t be legally killed because Hindus, who make up the dominant religion in India, consider all cows sacred. So the country is looking for solutions, including sanctuaries and artificial insemination to ensure female calf births only.

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