Real Science

While I still had my auto repair shop my nephew Dan worked for me awhile.
One day, while working on someone's radiator, he managed to aquire three long and fairly deep scratches on his forearm. Two of the scratches were exactly the same length and depth. The third was short and superficial. We ignored that one
Regarding this as an opportunity to actually test something about the world we live in, we decided to do a scientific experiment.
Seeing as how he would be treating the scratches identically (unlikely he would wash only half an arm, even accidentally)we had a chance to compare results.
If you think about it this is a rare opportunity.
So we decided to treat only one of the scratches with some over the counter medication known as (whatchacallit)sporin. The stuff that kills bacteria and promotes healing.
You can see it coming, Cant'cha?
That's right it took the treated wound longer to heal.
Most of the bacteria on your skin is beneficial, you are in a symbiotic relationship with it.
When you kill all of it, you lose.
Medicine, after all these years, is still the art of making money by making people sick.