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When I was still studying in senior high, my mathematics teacher told us a love story about the French mathematician René Descartes and a Swedish Princess Kristina. By the year 1648, when the princess is 18, Descartes was appointed to be the teacher of the young princess. Descartes taught her Cartesian...

>>The video is a speed up version of the whole process of lunar eclipse on Oct.8 . The most exciting news for astronomy fans in Taiwan this year, might be the lunar eclipse on Oct.8, and it's the first chance for people in Taiwan to observe the lunar...