Why is Paracelsus1 important? It’s a question that comes up repeatedly in this 2006 biography by Philip Ball. He didn’t actually discover anything (in any case, not so far as can be deciphered from his often cryptic writing). None of his theories have lasted (most were dismissed under even basic experimentation). Although he was a practical and skeptical man, he never really had a system for his work and it would be stretching the term to labelled it as “science”.