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100

This Dutch scientist used his microscope in 1676 to let us see bacteria for the first time.  


Who is Antonie van Leeuwenhoek?

100

In 1847, this doctor proved that simple hand-washing saves thousands of patients from death.  


Who is Ignaz Semmelweis?

100

In 1796, this scientist created the world's first true vaccine using cowpox.  


Who is Edward Jenner?

100

In 1828, this doctor performed the first successful human-to-human blood transfusion.  


Who is James Blundell?

100

In 1849, this woman became the first female MD, proving medicine is for everyone.  


Who is Elizabeth Blackwell?

200

This scientist's X-ray images in 1952 revealed the double helix structure of DNA.  


Who is Rosalind Franklin?

200

This scientist proved Germ Theory in 1861—that invisible microbes cause disease.  


Who is Louis Pasteur?

200

This woman brought the idea of variolation from Turkey to England in 1717 to help stop smallpox.  


Who is Lady Mary Wortley Montagu?

200

This scientist was the first to use ether as anesthesia in 1842 so patients felt no pain during surgery.  


Who is Crawford Long?

200

This nurse proved in 1854 that sanitation, fresh air, and statistics are keys to a safe hospital.  


Who is Florence Nightingale?

300

In 1895, this scientist discovered X-rays, allowing doctors to see broken bones without cutting skin.  


Who is Wilhelm Röntgen?

300

In 1928, this scientist discovered penicillin, the first antibiotic that could kill infections inside the body.  


Who is Alexander Fleming?

300

In 1955, this scientist created the polio vaccine and gave it to the world for free.  


Who is Jonas Salk?

300

In 1901, this scientist discovered blood groups (A, B, and O), making transfusions safe for everyone.  


Who is Karl Landsteiner?

300

In 1881, this woman founded the American Red Cross to bring emergency medicine to war zones and disasters.  




Who is Clara Barton?

400

This inventor created the stethoscope in 1816, letting doctors hear inside the body for the first time.  


Who is Rene Laennec?

400

This scientist created antiseptics in 1865 to kill germs on surgical tools and wounds.  


Who is Joseph Lister?

400

In 900 AD, this scientist moved away from magic and proved smallpox and measles are two different diseases.  




Who is Rhazes?

400

In 1543, this scientist mapped the human body by performing the first accurate human dissections.  


Who is Andreas Vesalius?

400

This woman founded the Frontier Nursing Service in 1925, bringing maternal care to rural areas on horseback.  


Who is Mary Breckinridge?

500

In 2003, this scientist led the team that mapped all 3 billion letters of the human genome.  




Who is Francis Collins?

500

This scientist discovered the specific bacteria causing Anthrax, Cholera, and TB in 1876.  


Who is Robert Koch?

500

This scientist developed targeted drugs to treat leukemia and created the first successful antiviral medicines in 1988.  



Who is Gertrude Elion?

500

 This scientist created the blood bank in 1940, finding ways to process, store, and ship plasma to save lives.  


Who is Charles Drew?

500

In 1953, this doctor created the Apgar Score, the first standardized way to check a newborn baby's health.  


Who is Virginia Apgar?