NASA滞留宇航员成功返回地球
在经历了286天计划外太空任务后，NASA宇航员布奇·威尔莫尔和苏尼·威廉姆斯于本周二结束创纪录的9个月太空滞留，搭乘SpaceX龙飞船安全降落在墨西哥湾。NASA连续推迟返回时间表，最终选择切换到SpaceX作为救援方案。考虑到本周晚些时候的不稳定天气，NASA提前让他们启程。
两位宇航员的太空飞行历程创造多项记录：累计行程1.95亿公里（1.21亿英里），完成4,576次地球轨道运行，威廉姆斯更以62小时太空行走刷新女宇航员累计时长记录。在延长期内，他们转型为正式空间站成员，承担设备维修、科学实验等任务，威廉姆斯还担任过空间站指挥官。
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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 cloud-based messaging platform is also adding Anonymous Group Admins feature. As per Telegram, this feature is being introduced for safer protests. As per the Telegram blog post, users can “Toggle Remain Anonymous in Admin rights to enable Batman mode. The anonymized admin will be hidden in the list of group members, and their messages in the chat will be signed with the group name, similar to channel posts.”
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