SpaceX团队完成人类首次载人环绕地球两极飞行任务
SpaceX团队完成人类首次载人围绕地球两极飞行任务，4名宇航员搭乘龙飞船成功降落太平洋。此次任务于上月底从佛罗里达发射升空，历时约4天，宇航员在430公里高空轨道观察探索地球两极。
期间团队开展22项科学实验，包括首次在太空拍摄人体X光图像和尝试种植蘑菇，并通过可穿戴设备监测宇航员健康数据，研究微重力环境对人体影响。
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“To the extent it is used I fear it’s often for illicit finance. It’s an extremely inefficient way of conducting transactions, and the amount of energy that’s consumed in processing those transactions is staggering,” the former Fed chairwoman said. Yellen’s comments have been cited as a reason for bitcoin’s recent losses. However, Yellen’s assessment of bitcoin as a inefficient medium of exchange is an important point and one that has already been raised in the past by bitcoin bulls. Using a volatile asset in exchange for goods and services makes little sense if the asset can tumble 10% in a day, or surge 80% over the course of a two months as bitcoin has done in 2021, critics argue. To put a finer point on it, over the past 12 months bitcoin has registered 8 corrections, defined as a decline from a recent peak of at least 10% but not more than 20%, and two bear markets, which are defined as falls of 20% or more, according to Dow Jones Market Data.
The Singapore stock market has alternated between positive and negative finishes through the last five trading days since the end of the two-day winning streak in which it had added more than a dozen points or 0.4 percent. The Straits Times Index now sits just above the 3,060-point plateau and it's likely to see a narrow trading range on Monday.
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