Qing 1645 Queue Order Jiangnan slaughter

A hairstyle became a loyalty test

In 1645, the Qing dynasty ordered adult Han Chinese men to adopt the Manchu hairstyle as proof of loyalty. Resistance in Jiangnan was followed by the slaughter of about 100,000 Han Chinese.

Dragonfish hunt with red light most deep-sea animals cannot see

Some deep-sea dragonfish make red light and can see it. Most other animals in the deep ocean cannot because natural red light disappears near the surface. The fish can therefore light up red prey without making the scene visible to many nearby animals.

Navigation satellites also provide precise timing

Global navigation satellite systems provide location, but their precise timing signals have other uses. Telecommunications networks use them to stay synchronized, and scientists use them as a reference in earthquake studies.

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Qing 1645 Queue Order Jiangnan slaughter

A hairstyle became a loyalty test

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