It would be impossible to know that "one person" discovered this or that.Knowledge doesn't really spread like that, especially in early humans. All animals have the instinct of curiosity; but only Primates have that "inner urge" to copy what they see. It is not unusual for quite a few people to "hit on" the same idea. Just take the early, albeit partial, control of fire.Many people would notice that the earth "baked" hard under the fire.Many would notice that when moist clay dried and baked it "turned into stone". The "wow!" moment would come when a few people noticed that something could be made of this "stone". It could be shaped whilst it was still clay! There you have the beginnings of making "marks" on tablets; and the beginning of Pottery.
It would be the same with cooking, with making weapons, with making tools. With each generation "copying" and improving on the first efforts.
Over many centuries, these many "improvements", all these "changes", become fascinating to Mankind. The "changes" would become what later Mankind called "magic". And so it is!
It is still being done to this day! Changing one or more things into something totally different. That's MAGIC!