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Jan 1, 1249
Glasses invented
Roger Bacon invents spectacles -
Jan 1, 1489
Autopsy
Leonardo da Vinci dissects corpses -
Microscope
Zacharius Jannssen invents the microscope -
Blood Cells discovered
Anton van Leeuwenhoek discovers blood cells -
Anesthetic
Dr. Horace Wells uses nitrous oxide as an anesthetic -
Contact lenses
First contact lenses developed -
Stethescope
Rene Laennec invents the stethoscope -
Pacemaker
John Hopps invented the first cardiac pacemaker -
Vaccine for measles
First vaccine developed for measles. -
Cancer Vaccine
First vaccine to target a cause of cancer