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Cryptocurrencies are based on a special field of mathematics called cryptography. 加密货币是基于一种特殊的数学算法,称为密码学。 Cryptography is the study of how to secure communication, and it's about two really important
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Today, we stand at a defining moment in our history. With seven straight months of job loss; the highest percentage of homes in foreclosure since the Great Depression; family incomes down $1,000 and t
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President Obama and King Abdullah of Saudi Arabia speak to the press after a working lunch at the White House where they discussed security issues, Afghanistan and their shared desire to see Israelis
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Hi everybody. Over the past seven years, we haven't just been recovering from crisis, we've been rebuilding our economy on a new foundation for growth-growth that benefits everybody, not just