What Did Robert Koch invent?

When was ether first used?

What was novocaine an improved version of?

What did Lister discover about his wards, that led to him publishing his ideas?

Who discovered chloroform?

What did John Snow invent, that ensured right dosages were used?

What chemical stopped blood from clotting?

Francis Rous and who discovered that citrate glucose allowed blood to be stored longer?

What important discovery did Karl Landsteiner have, that improved the success rate of blood transfusions?