哥伦比亚大学开始对示威学生进行停学处理后，一批学生占领哈密尔顿大楼，校方声称将开除占领大楼的学生。在历史上哈密尔顿大楼多次被示威学生占领。1968年反战学生占领该楼一周，校方叫来警察清场，抓捕700多名学生、打伤100多名学生，但学校答应了示威学生的所有诉求，包括停止与军方合作、取消在哈莱姆的公园建体育馆、赦免所有示威学生、校长和教务长辞职。1985年学生占领该大楼三周，校方答应学生诉求，剥离对南非的投资。这些都成为学校光荣历史的一部分。

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Date: 2024-06-20| 方舟子

The S&P 500 slumped 1.8% on Monday and Tuesday, thanks to China Evergrande, the Chinese property company that looks like it is ready to default on its more-than $300 billion in debt. Cries of the next Lehman Brothers—or maybe the next Silverado?—echoed through the canyons of Wall Street as investors prepared for the worst.

How Does Bitcoin Work?

Bitcoin is built on a distributed digital record called a blockchain. As the name implies, blockchain is a linked body of data, made up of units called blocks that contain information about each and every transaction, including date and time, total value, buyer and seller, and a unique identifying code for each exchange. Entries are strung together in chronological order, creating a digital chain of blocks. “Once a block is added to the blockchain, it becomes accessible to anyone who wishes to view it, acting as a public ledger of cryptocurrency transactions,” says Stacey Harris, consultant for Pelicoin, a network of cryptocurrency ATMs. Blockchain is decentralized, which means it’s not controlled by any one organization. “It’s like a Google Doc that anyone can work on,” says Buchi Okoro, CEO and co-founder of African cryptocurrency exchange Quidax. “Nobody owns it, but anyone who has a link can contribute to it. And as different people update it, your copy also gets updated.”