What did Valerie Thomas?

Answer 1

an illusion transmitter

http://inventors.about.com/od/photogallery/ig/African-American---T-to-Z/Valerie-L-Thomas---Illusion-tr.htm :)

Answer 2

Valerie Thomas was an African-American NASA scientist who invented the illusion transmitter, an early form of 3D technology that is still used in modern innovations like Video Games and medical imaging.

Answer 3

Valerie Thomas was the creator and founder of the illusion transmitter.