How true is the story of Francine, the automaton daughter of the philosopher and mathematician René Descartes? I share the book trailer of my novel entitled "Francine Descartes: the broken axis of the soul". I hope you like it (text in Spanish). ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-mvELetnqJ1U.html
How to make a samurai sword? Step 1: don't use aluminum If you can whack it into shape with a hammer, then its going to get whacked out of shape if you ever strike something with it
This showed up on NHK World which has a nicer documentary. On the 3rd try, it was designed to miss the 1 meter away target. www3.nhk.or.jp/nhkworld/en/ondemand/video/2032192/
I see that it pushes the bow forward when firing. I remember seeing a RU-vid video about how pushing the bow forward for extra velocity was actually a common practice among bowmen around the world in the Medieval era.