This Dictionary is fantastic. Littered with great wee illustrations, as well as written clearly for the average person to understand. It comes in handy when reading about a new topic and is far quicker than 'googling' a term. I recommend this to everyone who has an interest in Science and Engineering!
Extremely useful dictionary of science for high-school and undergraduate students (and for the odd memory refresher). The book gives definitions, explanations and where necessary illustrations for most things science and biology related.