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
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
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
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
