Tech centimillionaire and middle-aged human man Bryan Johnson, founder of the online payment behemoth Braintree, among other ventures, wants to be 18 again. Not mentally or spiritually, but physically so — Johnson's on a quest to turn back his biological clock, returning his body's 45-year-old "brain, heart, lungs, liver, kidneys, tendons, teeth, skin, hair, bladder, penis and rectum" to each of
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