XKCD #2011

Newton's Trajectories

With just one extra line, he could have anticipated the 2003 film The Core, but some things are too audacious for even the greatest visionaries.

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Warning from xkcd.com : 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).