To All, before you cast your vote for the person of the twentieth century, I would like to point out a couple of little known "facts" about the leading contenders.

Albert Einstein
Einstein couldn't drive a car, in fact he was a worse driver than my Aunt Sally, and Auntie was a shocker of a driver. The average competent drivers IQ is 105, I ask, well then what was Einstein's?
Einstein when buying cloths, like a suit, would purchase 7 identical suits. Why? because he couldn't be bothered choosing daily what to wear. No fashion sense.
Einstein's favorite ice cream flavor was pistachio, I can understand a person liking vanilla, or chocolate or even strawberry, what kind of sick mind has a favorite ice cream flavor of pistachio?

Adolf Hitler
Hitler's only true friend, not counting Eva Braun and she committed suicide, was his dog Blondie. Hitler once commented how cruel it was to keep a goldfish in a bowl. The man obviously had a lot of compassion for animals.
Hitler was having it off with his niece, she committed suicide.
What did Adolf Hitler and Joe Starlin have in common? Both their wives committed suicide. Didn't have much luck with the ladies did old Adolf. Could be worth the sympathy vote.

If the category was to nominate the Prophet of the twentieth century I would wish Douglas Adams (PBUH) to be shortlisted if only for the Meaning of Liff books...

However, as it is for mere mortals and not even for worthiness but for impact (good or bad) I would like to add an Honorable Mention along with my earlier nominee.

A person whose contribution from 1920 daily impacts billions of people (for good and bad) in many more billions of ways through the theft of our autonomy:

Police officer William Potts of Detroit, Michigan

for the creation and introduction of the four-way, three-colour traffic light.

WmTrevor

>>Police officer William Potts of Detroit, Michigan

for the creation and introduction of the four-way, three-colour traffic light.>>

Surely you've got this the wrong way around.

The purpose of traffic lights is not "impact" but rather "avoiding impact."

:)

As Ricky Ricardo might have said, "Lucy, I'm homonym."