[metmom]

Actually there are five or six relatively unknown Black’s who’ve either discovered or invented things not commonly known. I’ve hit several Black people with that when they gave me a hard time of not knowing Black history. They didn’t know it themselves.

What are they?

I do know one myself.

[SkyDancer]

Well it's who are they. Okay, here's a list:

Who was the first at the North Pole?

Then: A A+ B- O+

Traffic signals

Grease fittings on locomotives.

There's more but this is a good start.