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Mirror Empires

After centuries of division into warring states, China was united in 221 BCE, under the short-lived Qin and then the long-lived Han dynasties. Just a few years later, in 209 BCE, the nomads of the steppe north of China were united under the Xiongnu confederation. 155 more words

The Forgotten Revolution

259-133 BCE

103,049. Here’s where this number comes from: Take a sequence of symbols, (a b c d e f g h i j), say. Construct as many groups as you want by sticking parentheses around any two or more symbols or groups. 353 more words

End of the Eclipse

Today’s post is for those who still haven’t had enough of the recent lunar eclipse. I set an early alarm that day to try to catch the eclipse during totality. 361 more words