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Bret Taylor, the chairman of OpenAI’s board, said the artificial intelligence company was “not for sale.” Mr. Musk is separately raising money for his A.I. start-up, xAI. By Cade MetzMike ...

By Madeleine Ngo and Brad Plumer An estimated 15 colleges still required Covid vaccines for students as of late last year. No states ... his advisers would devise new tariff levels reflecting ...

Prices of cryptocurrencies are extremely volatile and may be affected by external factors such as financial, regulatory or political events. Trading on margin increases the financial risks.