Martinus Beijerinck in 1898.
radium
discovering
Christopher Columbus was an early explorer. He is credited with discovering the Americas.
Europe is the country credited with discovering America.
Euclid
I'm not exactly sure what you mean when you say "discovering." However, Alexander Graham Bell is credited for inventing it. -THE SMOKE LIVES
leif erikson
Columbus
Marie Curie
Florida
Sir Humphry Davy in 1808
he is credited with discovering the Pacific Ocean.