Dr. Stone episode 3 eng sub
“Weapons of Science”
Aware of Tsukasa’s murderous intent, Senku sends him away to the source of the revival fluid while he and Taiju make a batch of revival fluid to finally revive Yuzuriha. Needing weapons of science to stop Tsukasa’s murder spree, Senku, and the others begin traveling towards Hakone, with Yuzuriha managing to find the Great Buddha of Kamakura to serve as a landmark. The trio eventually arrives at a volcanic hot spring, giving Senku the means to create gunpowder.