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In the 1940s, U.S. doctors led experiments that intentionally infected thousands of Guatemalans with venereal diseases. A closer look at how it happened, and who knew: John Cutler, the young investigator who led the Guatemalan experiments, had the full backing of US health officials, including the surgeon general. “Cutler thought that what he was doing […]

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Meet the researchers who are developing new methods for countering global warming using geoengineering. Some solutions come with great risks: While such tactics could clearly fail, perhaps the greater concern is what might happen if they succeeded in ways nobody had envisioned. Injecting sulfur dioxide, or particles that perform a similar function, would rapidly lower […]

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