Little bit of fun for today courtesy of last night’s Royal Institution Science Quiz. It was a pretty fiendish effort (our score of 40.5/60 was comfortably inside the top half) and the picture round was one of the toughest. Thanks for these pictures go to co-quizmaster Matt Brown of Londonist.com, the best place for all things London.

The challenge: identify the famous scientist or inventor depicted here:

Answers in the comments!