蓝色起源完成全女性太空飞行任务 凯蒂·佩里等六人突破卡门线
杰夫·贝索斯旗下蓝色起源公司于4月14日成功执行NS-31亚轨道任务，搭载六名女性乘员完成10分钟太空飞行，这是继1963年苏联宇航员捷列什科娃后首个全女性太空任务。
乘组包括歌手“水果姐”凯蒂·佩里（Katy Parry）、CBS主播盖尔·金、以及贝索斯未婚妻劳伦·桑切斯等六人。任务使用“新谢泼德”（New Shepard）可回收火箭系统，飞行高度突破100公里卡门线（即国际公认的太空边界），乘员舱配备定制化女式航天服。
蓝色起源迄今已完成11次载人飞行，单座票价起价15万美元。
NPR | 新华网
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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.”
The lead from Wall Street offers little clarity as the major averages opened lower on Friday and then bounced back and forth across the unchanged line, finally finishing mixed and little changed.The Dow added 33.18 points or 0.10 percent to finish at 34,798.00, while the NASDAQ eased 4.54 points or 0.03 percent to close at 15,047.70 and the S&P 500 rose 6.50 points or 0.15 percent to end at 4,455.48. For the week, the Dow rose 0.6 percent, the NASDAQ added 0.1 percent and the S&P gained 0.5 percent.The lackluster performance on Wall Street came on uncertainty about the outlook for the markets following recent volatility.
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