1) The X-Ray machine started being used in hospitals. Doctors and nurses couldn't believe their eyes when they could start seeing bone breaks beneath the skin.
2) Morphine replaced Cocaine as the preferred drug in hospitals.
3) Independent ambulance drivers would receive around $3 from a hospital for a patient who was alive and $1 for one who was dead. Dead bodies were needed for research.
4) Phones weren't widely used in the poorer communities so ambulance services would recruit people who lived there to let them know first if someone was sick. They'd pay the individuals around $.50 cents per pick-up. 5) Fights would often occur between competing ambulance services when they showed up at the same time so it was smart to have at least one person per ambulance crew who was a large brawler. If a policeman showed up the winner of the fight would typically give him $1 dollar to not file assault charges.
6) Some doctors were intrigued by the vacuum cleaner that was invented and came up with a way to use similar technology to suck blood through a tube (suction), which allowed them to see what they were doing a lot better when they performed surgery. This was a huge invention.
There's a lot more of course, but isn't it amazing how far we've come?