What Makes Life Tick? Mitochondria May Keep Time for Cells

Just as people in different places seem to operate at different rhythms, so too do different species. They age at their own rates: Some, like the fruit fly, race to adulthood so they can reproduce before their ephemeral food source disappears, while creatures like humans mature slowly over decades, in part because building a large, complex brain requires it. And at the very beginning of an embryo’…

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