Talk:89: Gravitational Mass

Explain xkcd: It's 'cause you're dumb.
Revision as of 16:21, 9 September 2013 by NeatNit (talk | contribs)
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Can anyone add more information about the information stated in the first panel? It is the most intriguing part. --NeatNit (talk) 16:21, 9 September 2013 (UTC)