Can you name some people who will not soon be forgotten?

I have recently started to collect stamps again as a hobby, and also as kind of an investment for once I’m bored of it.

I have chosen to collect stamps related to science, and stamps that show people who had a big impact on the world. People who everyone knows, and who will not soon be forgotten by history.

So far, I have some stamps that show Adolf Hitler, and Albert Einstein. That is more or less the level of importance and impact I am looking for the people to have, people who changed the world forever, for good or bad.

Thanks.