All comics copyright Randall Munroe, xkcd.com
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From xkcd.com:
Warning: this comic occasionally contains strong language (which may be unsuitable for children), unusual humor (which may be unsuitable for adults), and advanced mathematics (which may be unsuitable for liberal-arts majors).
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Are you running a pre-release beta version of iOS? Youll probably notice some things not working correctly. Please send me a note letting me know about the issue rather than leaving it in a review.