布隆伯格(Michael Bloomberg)认为，过去二十年美国学区花了数十亿美元为教室配备笔记本电脑，然而学生的基本技能却下降了。目前有约九成的美国学校为学生提供了笔电，但学生的考试成绩则徘徊在历史最低点——只有 28% 的八年级学生熟练掌握数学，30% 的八年级学生熟练掌握阅读。研究证实，传统方法——在纸上阅读和写作——仍然优于基于屏幕的方法。设备会分散学生的注意力，研究表明，非学习活动后需要长达 20 分钟的时间才能重新集中注意力。布隆伯格建议学校重新考虑课堂电脑政策，呼吁学校重新使用书本和笔，而不是笔记本电脑和平板电脑。 /.:'Kids Are Spending Too Much Class Time on Laptops'
布隆伯格(Michael Bloomberg)认为，过去二十年美国学区花了数十亿美元为教室配备笔记本电脑，然而学生的基本技能却下降了。目前有约九成的美国学校为学生提供了笔电，但学生的考试成绩则徘徊在历史最低点——只有 28% 的八年级学生熟练掌握数学，30% 的八年级学生熟练掌握阅读。研究证实，传统方法——在纸上阅读和写作——仍然优于基于屏幕的方法。设备会分散学生的注意力，研究表明，非学习活动后需要长达 20 分钟的时间才能重新集中注意力。布隆伯格建议学校重新考虑课堂电脑政策，呼吁学校重新使用书本和笔，而不是笔记本电脑和平板电脑。 /.:'Kids Are Spending Too Much Class Time on Laptops'
BY Solidot 纯净版
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China’s stock markets are some of the largest in the world, with total market capitalization reaching RMB 79 trillion (US$12.2 trillion) in 2020. China’s stock markets are seen as a crucial tool for driving economic growth, in particular for financing the country’s rapidly growing high-tech sectors.Although traditionally closed off to overseas investors, China’s financial markets have gradually been loosening restrictions over the past couple of decades. At the same time, reforms have sought to make it easier for Chinese companies to list on onshore stock exchanges, and new programs have been launched in attempts to lure some of China’s most coveted overseas-listed companies back to the country.
Telegram and Signal Havens for Right-Wing Extremists
Since the violent storming of Capitol Hill and subsequent ban of former U.S. President Donald Trump from Facebook and Twitter, the removal of Parler from Amazon’s servers, and the de-platforming of incendiary right-wing content, messaging services Telegram and Signal have seen a deluge of new users. In January alone, Telegram reported 90 million new accounts. Its founder, Pavel Durov, described this as “the largest digital migration in human history.” Signal reportedly doubled its user base to 40 million people and became the most downloaded app in 70 countries. The two services rely on encryption to protect the privacy of user communication, which has made them popular with protesters seeking to conceal their identities against repressive governments in places like Belarus, Hong Kong, and Iran. But the same encryption technology has also made them a favored communication tool for criminals and terrorist groups, including al Qaeda and the Islamic State.
