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Personality Whether the shape of a personality is partly inherited — and the twenty years of famous findings that turned out not to replicate. Risk-taking and impulsivity Trading, betting, and every "should I?" at 2am. Over a million people were studied: 99 positions turned up, 46 of them shared with risky be… Weight-loss medicines GLP-1 drugs made obesity genetics a dinner-table subject. Caffeine and energy drinks The most-consumed drug on earth, metabolised at wildly different speeds.