The Prompter

I've always wondered, who was the first? Some things are intuitive. For example, at some point, someone decided that if they wanted to kill an antelope for meat, it might be easier if they made something to throw, and there came the spear. Eventually, someone else decided that spears might be more effective if they put stone heads on them. But other things must have been more difficult. Who was the first to determine that cinchona bark could be an effective treatment for malaria? Does it se...