Top image, top left to bottom right:
- Richard Dawkins, evolutionary biologist who, among many other noteworthy career achievements, first coined the word "meme" (the Internet thanks you!).
- Stephen Hawking, no description needed, he's Stephen Motherf**n' Hawking.
- Peter Higgs, theoretical physicist after whom the Higgs boson was named.
- Brian Cox, particle physicist and ATLAS project contributor at CERN.
Bottom image, left to right:
- Who cares?