There are many layman's books on cosmology and modern scientific theories. Somethimes it can be hard to distinguish truth from misrepresentation. However, one can be sure that hearing these theories 'straight from the horse's mouth (as Hawking is responsible for the development of many of them) that one is being told the truth. He consciously presents his ideas in a non-mathematical way to make the book accesible to anyone. Do not make the mistake of thinking that this is a beginner's book only. I am a student studying theoretical physics and i gained new insight into ideas I thought i understood. A Brief History of Time displays excellently Hawking's natural humour and his brilliant teaching skills. A Brief History of Time is an essential classic.