Every three days Nathan (not his real name), a 27-year-old venture capitalist in San Francisco, ingests 15 micrograms of lysergic acid diethylamide (commonly known as LSD or acid). The microdose of the psychedelic drug – which generally requires at least 100 micrograms to cause a high – gives him the gentlest of buzzes. It makes him feel far more productive, he says, but nobody else in the office knows that he is doing it. “I view it as my little treat. My secret vitamin,” he says. “It’s like taking spinach and you’re Popeye.” --snip -- Young developers and engineers, most...