Everything you need to understand or teach Life, the Universe and Everything by Douglas Adams.
"Life, the Universe, and Everything" is a humorous science fiction novel that tells the story of the accidental space traveler Arthur Dent, an Englishman who escapes the destruction of the Earth and ultimately saves the universe from complete destruction. The book is the third in the series of "Hitchhiker's Guide to the Galaxy" books.
As the book opens, Arthur Dent is living in a cave on prehistoric Earth having been sent...