Weird Universe has discovered a sex education manual from 1972 for pre-pubescent boys, and uploaded every page. It's totally filled with useful information, too, such as the chapter "Words You Will Want to Know," which includes the word "penis," just in case 12-year-old boys weren't aware of what to call that thing between their legs. Under the section "Don't Believe Everything You Hear," it lists "Men with deeper voices are more manly" as a myth; maybe these researchers need to know. [Weird Universe via Boing Boing]