The Zebra Puzzle is a famous logic puzzle. Its authorship is frequently attributed to a young Albert Einstein, and sometimes instead to Lewis Carroll, but there is little evidence to support either as the author. Furthermore, some of the brands of cigarette in the puzzle didn't exist in Carroll's lifetime, nor in Einstein's youth. The precise details of the puzzle (such as the brand names) vary. The clues below are taken from the first known publication. The question that the puzzle poses is: Who drinks water, and who owns the zebra?