Theoretical Physicist and Cosmologist
Stephen Hawking was a theoretical physicist, author, and Director of Research at the Centre for Theoretical Cosmology. He was the first to set out a theory of cosmology explained by a union of the general theory of relativity and quantum mechanics.
Source, HeLa Cell Line
Henrietta Lacks was an African-American woman, whose cancer cells were the source of the HeLa cell line, the first immortalized cell line and one of the most important cell lines in medical research. An immortalized cell line will reproduce indefinitely.