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Here’s what you need to know: The C.D.C. reverses its guidance on testing for people who were exposed to the virus and aren’t showing symptoms. Emails by a former top Trump health official and his science adviser show efforts to silence the C.D.C. Trump acknowledged that distribution of an authorized …

GamesBeat Summit Watch every session from the annual event On Demand Watch Now Unity Technologies saw its stock price rise 32% to $ 68.88 a share in the first day of trading as it launched an initial public offering at a $ 13.6 billion valuation. Trading under the symbol U, …

Rido / Shutterstock.com It’s time to think beyond crossword puzzles and sudoku. While some research does show that these activities and other “brain-training” games can slow cognitive decline, they aren’t the only ways to keep your mind sharp. Try one of these other strategies to avoid embarrassing memory lapses. All …