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Twenty years after the introduction of the theory, we revisit what it does—and doesn’t—explain. by Clayton M. Christensen, Michael E. Raynor and Rory McDonald Please enjoy this HBR Classic. Clayton M.

Maca is a plant native to Peru. Its root is a natural remedy for some people to treat specific health issues, including infertility and low sex drive. However, more research is needed. Maca is a plant ...