So... It's Not Flat?

Richard Thaler at Edge asks people for their favorite examples of wrong scientific beliefs, such as the world being flat and more. Scripps' Eric Topol responds that in medical school he was taught that one cells differentiated into heart muscle or nerves that they can never regenerate. "Wrong!! Enter the stem cell and regenerative medicine era," he adds. Derek Lowe names the four humors theory of physiology and that bad air caused infectious disease.

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The partially reinstated US travel ban leaves space for uncertainty for researchers, Nature News says.

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In PNAS this week: DNA methylation profiles of tumor tissue, gene dynamics in prokaryotes, and more.