As my brother notes, it is indeed a slow blog day. The Alchemist's Challenge is a surprisingly well-written quiz, covering quite a breadth of knowledge. Sans Google, I got 70% correct.
2247 other users have thus far accepted the Alchemist's Challenge. Their average score is 55 percent correct.
Out of a total of 50 questions, you answered 35 correctly – that's 70 percent correct.
(via Making Light: Particles)