The Presidential Daily Brief

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  1. Ancient Gene Helps Tibetans With Altitude

    If climbing to great heights leaves you breathless, you’re likely missing some ancient genetic material. Scientists say a variant of the EPAS1 gene, which affects blood oxygen levels and is common among Tibetans, helps them fare better at high altitudes than the rest of us. The gene stems from an extinct species of humans known as the Denisovans, who interbred with Homo sapiens 50,000 years ago and whose DNA is still helping some in our species navigate the harsh Tibetan plateau.

    NPRChristian Science Monitor

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