美军拟在太平洋岛屿测试"火箭货运" 90分钟全球投送军事物资
美国空军宣布将在太平洋约翰斯顿岛建造两座火箭着陆平台，测试"火箭货运先锋"计划。该计划旨在利用可重复使用火箭（推测为SpaceX技术）将军事物资送入太空后精准投送，实现90分钟内全球到达的战略补给能力。
选址位于夏威夷西南700海里的约翰斯顿环礁。评估报告将于4月初公布并开放公众评议。
美军自2020年起就探索太空物流方案，退役将领曾设想"1小时内投送C-17运输机载货量"。尽管单次发射成本仍高达数千万美元，远超传统空运，但军方认为这种突破性能力将重塑军事后勤体系，为紧急战备和人道救援提供新选择。
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Telegram is riding high, adding tens of million of users this year. Now the bill is coming due.Telegram is one of the few significant social-media challengers to Facebook Inc., FB -1.90% on a trajectory toward one billion users active each month by the end of 2022, up from roughly 550 million today.
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.”
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