The Science of Bows and Arrows / Mr. Denjiro’s Happy Energy! #754 Published 2023-10-06 Download video MP4 360p Download video MP4 720p Recommendations 03:01 The Science behind Blowguns / Mr. Denjiro’s Happy Energy! #737 08:30 古代の武器①/Ancient Weapons 03:01 The Science of Bows: The Compound Bow / Mr. Denjiro's Happy Energy! #777 01:27 和弓は何で下の方を握るの？ 03:01 The Ancient Science of Long-Distance Throwing: Catapults / Mr. Denjiro’s Happy Energy! #722 21:21 飛び道具大革命！「弓矢」の誕生 #25 08:20 刃物の歴史/History of Cutlery 14:34 Bizarre traveling flame discovery 11:10 The process of making arrows. The skilled skills of Japanese bow and arrow craftsmen are astonishing 03:01 Screws and Matchlocks / Mr. Denjiro's Happy Energy! #782 19:47 What Happens if you MIX ALL The METALS Together? 09:31 日本でイチバン強い弓道部に潜入！筋力よりも〇〇力が大事？強さの秘密とは！ 03:01 フライングディスクの科学／The Science behind Flying Discs 03:01 Bolas: An Ancient Weapon / Mr. Denjiro's Happy Energy! #787 12:05 Wirtz pumps are really clever 18:05 Light sucking flames look like magic 03:01 A Whip Moves Faster than the Speed of Sound?! / Mr. Denjiro's Happy Energy! #743 12:07 Space filling curves filling with water 03:01 The Power of a Pulley / Mr. Denjiro’s Happy Energy! #505