A page out of Leonardo DaVinci's Codex Lecester describing the moon's orbit.
The Citation Machine This site offers bibliographic assistance. You type in the important information from your source and it formats if for you. A good time saver.
Word Origin AKA, Etymology (study of the "true sense" of a word) resources
There has also been some interest in phrase origin. So much so, that it may someday be the source of an assignment. Stand by. In the meantime, feel free to noodle through this site assignment free!