"Yeah, sure you could, there's tons of metals out there that are far better suited to tool making after all, iron and steel for example." Senku said, in his usual patient tone.

"But I don't have the resources to make them. I would need a source of iron, and a forge, and probably a lot more time and help to get a single knife done. All of that is doable, of course, but probably not in the time limit we have going on here. Building a forge is a pain, but possible. I saw shells on the beach, if they are made of calcium carbonate, you could make mortar."