A number so epic it will collapse your brain into a black hole! Yet Tony Padilla and Matt Parker take the risk of discussing its magnitude. Watch with caution.

See also our video about the Googol and Googolplex at:http://www.youtube.com/watch?v=8GEebx72-qs

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Videos by Brady Haran

More about Matt and Tony at: http://www.numberphile.com/team/index.html

Matt’s section filmed at the Champagne Bar at St Pancras train station.