Scenario A: Scientists discover a compound that protects against Alzheimers. Scenario B: Scientists discover a compound that enhances human cognition. Americans' ethical intuition tends to support cure and prevention (and Scenario A) but frown upon performance enhancement (and Scenario B).
But what happens when it is the same compound in both scenarios? This article looks at the research and ethical questions surrounding the hormone Klotho, named for one of the Greek Fates:
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