they didn't document it
Leif Ericson.
christopher Columbus and leif ericson
Amerigo Vespucci is given the credit for discovering America.
St Brendan from Ireland of course.
Karl Wilhem is given credit for discovering simple machines
Gilbert N. Lewis was given the credit for discovering how a covalent bond works.
J. J. Thompson was given credit for discovering the first electron.
Darwin.
J.J. Thomson
Amerigo Vespucci was a ignorant sailor and storyteller. he would sit in a tavern and tell his false stories of traveling to America. he was not only given credit, a German map maker named America after him! boy, what a lie! - AnSwEr
Captain James Cook.
no one is given the credit of discovering maths