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Could one pill help us live longer? Scientists and investors are racing to find a drug to slow aging, trying things like metformin and rapamycin. But the breakthrough might not come from humans.

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A container of blood plasma is being extracted from a centrifuge for a medical procedure
Spinning blood in a centrifuge to remove the plasma can treat certain medical conditions, and some doctors are exploring the benefits for longevity too.
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Bryan Johnson collage with needles, snowflakes and a raver
While the summit was billed as possibly "the most important day of your life," the talks were less in-depth than I had expected.
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A woman on an elliptical.
Amy Hardison, a grandmother of 64, currently holds a top rank in the Rejuvenation Olympics for having slowed her biological aging and improved her health.
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Bryan Johnson.
Bryan Johnson just asked X whether he "peaked" in 2018 or 2024.
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Bryan Johnson
Bryan Johnson, a 45-year-old biotech founder, hopes to rewind the clock of his body a few decades through a program he started, called Project Blueprint.
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Bryan Johnson (left) and Elon Musk (right).
Bryan Johnson (left) and Elon Musk (right).
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A composite image of Bryan Johnson and his pre-blended meal.
For lunch, tech exec Bryan Johnson has a 'Super Veggie' bowl that includes a mix of boiled vegetables and lentils.