（　ΘДΘ）　　うーーん。。。

https://www.youtube.com/watch?v=41Iiq6ap50I
https://www.youtube.com/watch?v=cQTY5l3V3bE
https://www.youtube.com/watch?v=S7niTP0PZto


https://www.youtube.com/watch?v=HY2y2lrvTWo
https://www.youtube.com/watch?v=GniGDEpNxjk
https://www.youtube.com/watch?v=LQqrIRo6YTo

https://egg.5ch.net/test/read.cgi/scienceplus/1509096127/340-366　　
https://www.youtube.com/watch?v=jn8qW24SEVc

http://pbs.twimg.com/media/BDCrs4NCIAAbCM6.jpg:small