你永远也梳不平一个毛球？！
选题参考：《环球科学》期刊：https://mp.weixin.qq.com/s/mZfUEqTxFclc1_HJruJS7g
部分画面引用：
1、3Blue1Brown - The Hairy Ball Theorem：https://www.youtube.com/watch?v=BHdbsHFs2P0&t=541s
2、NASA Space News - Limitless Energy! China’s ARTIFICIAL SUN Breaks Fusion Record：https://www.youtube.com/watch?v=FcZP4_CoYDo
3、Cluster of Excellence ctdqmat - Hairy Topology: How many whirl remain on the ball and the doughnut?：https://www.youtube.com/watch?v=sPWN2_ZejUo
