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Blockchains are kept in "peer-to-peer" networks that are continually updated and kept in synchronization. It would require huge amounts of computing power to access every instance of a certain blockchain and alter all its blocks at the same time. A network of tech-savvy users known as miners pour their computing power into maintaining the blockchain and verifying its transactions, ensuring that someone cannot spend the same coin again after paying for something with it.
Bloomberg will be 78 on Election Day 2020 — older than anyone ever elected president of the United States.
Bio Farma and Sinovac signed an agreement in August for the supply, production and technology licensing of CoronaVac. Sinovac has committed to supply bulk vaccines to Bio Farma, allowing it to produce at least 40 million doses.
Born in India and completing his primary education in Singapore, Feng came to the US for college and eventually earned a PhD in physics in 1976. He began his academic career at the University of Texas at Austin and worked as vice-president of the Fortune 500 Science Applications International Corporation before becoming the vice-president for research and graduate study at the University of Texas at Dallas (UTD) in 2000.
BigDoor, the Seattle upstart that’s attempting to deepen engagement on Web sites through game mechanics, said that it has promoted Tommy Lee to vice president of business development and Carrie Peters to vice president of marketing.
来源：资阳报