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Elizabeth Holmes intentionally hid the use of third-party testing devices from Walgreens, its biggest partner, in order to protect "trade secrets," the former Theranos CEO testified in her third day on the stand for her ongoing fraud trial in San Jose.

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Theranos CEO Elizabeth Holmes took the stand in a San Jose courtroom on Friday, beginning her testimony in the criminal fraud case against her.

So far, Holmes' attorneys have stuck to a few themes of her defense, including highlighting Holmes' inexperience as a college dropout and pointing the finger at Sunny Balwani, Theranos' former COO and president. She began her testimony by covering her background and how she came up with the idea of Theranos during college.

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Google is asking the Justice Department to look into whether Jonathan Kanter, the new head of the antitrust division, should work on the lawsuit against the company.

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General Motors is getting into the chip business.

After months of chip shortages have crippled the world's largest automakers' production, costing the industry hundreds of billions of dollars in lost revenue, GM said that it is partnering with seven chip makers to design the silicon necessary to reduce the number needed and improve their quality.

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Citadel CEO Ken Griffin said that he outbid the ConstitutionDAO group of cryptocurrency enthusiasts for a first-edition printing of the Constitution at a Sotheby's auction Thursday, killing the hopes of the ragtag bunch of online donors who had hoped to make a bold statement about the future of the internet.

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Banks need to tell federal officials of large cybersecurity issues such as ransomware attacks within 36 hours under a new requirement approved Thursday.

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The Chamber of Commerce, the most powerful business lobbying group in the U.S., launched a series of attacks on the Federal Trade Commission on Friday and threatened litigation to push back on the progressive agenda of chair Lina Khan.

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Facebook is giving users more control over what they see in News Feed, the company announced Thursday. Over the coming weeks, the company will being allowing some users to tweak their preferences in News Feed to change the amount of content they see from different accounts, pages and groups, as well as the topics that appear in their News Feeds.

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The ConstitutionDAO raised more than $40 million to win a copy of the U.S. Constitution, but ultimately it wasn't enough. The online group, which organized itself using blockchain technology, lost an auction at Sotheby's that ultimately ended with a winning bid of $43.2 million.

"While this wasn't the outcome we hoped for," said Julian Weisser, one of the group's leaders, "we still made history tonight with ConstitutionDAO. This is the largest crowdfund for a physical object that we are aware of — crypto or fiat."

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A federal judge on Wednesday dismissed a lawsuit against Robinhood that had accused the company of colluding with Citadel Securities to limit trading of GameStop and other meme stocks in January.

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