A cartoon to help in teaching the importance of labeling the axes of a graph. The cartoon is number 833 (December 2010) from the webcomic series at xkcd.com created by Randall Munroe. Free to use in the classroom and on course web sites under a creative commons attribution-non-commercial 2.5 license.
All life is an experiment. The more experiments you make the better. is a quote by American author and poet Ralph Waldo Emerson (1803 - 1882). The quote was written as a journal entry on November 11, 1842.
Don 't worry about polls, but if you do, don't admit it. is a quote by former First Lady Eleanor Rosalynn Smith Carter (1927 - ).
Theory is a good thing, but a good experiment is forever. is a quote by Russian nobel prize winning physicist Pyotr Leonidovich Kapitsa (1894 - 1984). The quote is found on page 160 of "Experiment, theory, practice, articles and addresses volume 46."
...experiment without mathematics will neither sufficiently discipline the mind or sufficiently extend our knowledge... is a quote by Scottish geophysicist Balfour Stewart (1828 - 1887). The quote is found in a letter from Stewart to Henry Roscoe of Owens College on June 2, 1870.