Phrenology might have been misguided, but it did lead to more advanced discoveries in psychology. Which is what I also love about science. Scientists take weird bizarre ideas and test them. If they stand up to the test, they can be explored further. Scientists recognize if there is something of value, and they are not afraid to adjust their viewpoint. Science does not cling to an idea simply because it was written in some old book.
Now, Nicola Tesla - there's a scientist! Mainstreamers didn't recognize his genius. When I was a kid my dad built a Tesla coil. He spent hours and hours wrapping copper around a post, then he entertained us (and all the neighbourhood) with his "lightening machine." (I still wonder if it contributed to his and my mom's cancer diagnoses). I tried to write an essay about Tesla at school at the time, but could find absolutely nothing in the libraries about him. That's another way science has advanced - we now have the Internet, we now have shared knowledge. I was so thrilled to discover the truth about Tesla on the Internet as an adult. It's all out there now - the good, the bad, the mistakes, the journey.
p.s., Brizzy - leeches are still actually used among more progressive healers. They have an amazing ability to reduce swelling and promote healing. It's interesting how so many of these traditional forms of healing have not been discounted completely and are now being used to great effect.