
In a new investigation into secret IRS documents, ProPublica reveals how American billionaires manage to pay little or no income tax — without breaking the law. For months now, some scientists have been calling attention to the once-controversial idea that the coronavirus originated in a laboratory. Vox lays out what we know and don't about the lab-leak theory. The growth of for-profit medical schools is raising questions about how the U.S. will train its next generation of doctors. NPR looks at the issue. National Geographic's cartographers say they now recognize a fifth ocean: the Southern Ocean, which encircles Antarctica.
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