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Text size PayPal's has a new interim CFO. Justin Sullivan/Getty Images …

Text size Gamers compete at the 'Nvidia' booth during the Electronic Entertainment Expo E3 in Los Angeles.…

Text size Nasdaq-listed Antares Pharma is being bought by Halozyme Therapeutics in a deal valued at $960 million.…

Text size Dreamstime Nvidia…

Elon Musk won't join Twitter's board, after all. (Photo by JIM WATSON/AFP via Getty Images) Photograph by JIM WATSON / AFP…

Elon Musk won't join Twitter's board, after all. (Photo by JIM WATSON/AFP via Getty Images) Photograph by JIM WATSON / AFP…

Tesla CEO Elon Musk has suggested that the electric vehicle maker might get into the mining business. Patrick Pleul/POOL/AFP…

Text size Warren Buffett. Paul Morigi/Getty Images for Fortune/Time Inc Warren…

Text size Shares of HP jumped 15% this past week after Warren Buffett’s Berkshire Hathaway disclosed a large stake.…

Tracy Britt Cool spent a decade working for Warren Buffett. She now wants to buy the kinds of companies that might have interested the famed investor 30 or 40 years ago. Those are businesses typically run by founders…