That earned a chuckle, but Senku was very amused at the whole situation. He could only imagine watching someone do this manually for the first time. He guessed it was much like his friends watching him build a rocket. Many kids said they would one day or maybe do something like that. Senku just did it. And he had made it actually go into space. Taking the flint back, Senku cracked it a few more times until they had a decent size ember burning in the twigs.
"They're like monkeys without science," he commented simply, not meaning offense. "The monkeys who watched me in the stone world probably thought I was insane. But I was likely the first human they had ever seen." He blew air on the embers burning and within a few minutes, they had a full blown fire going. Still in science mode, Senku motioned to the other ingredients that Theo had brought out for them.
"The ingredients I collected will work. Pure minerals make the best reaction, but these will do. Which one do you want to try first?" He was letting Theo run the show and would insist on his friend actually putting the ingredients in the fire to cause the reaction.