I'm posting one puzzle, riddle, math, or statistical problem a day. Try to answer each one and post your answers in the comments section. I'll post the answer the next day. Even if you have the same answer as someone else, feel free to put up your answer, too!
Friday, August 17, 2007
Origin of the Species
Charles Darwin was best known for his work, "Origin of the Species." What was the name of the last book he ever wrote, published in 1881?