The recipe is changed for Coke and Pepsi (in the US). It is because of the chemical 4-methylimidazole, which would require the companies to put a cancer warning on their labels. In this video we warn you not to drink more than 1,000 cans of the drink in a single day! More chemistry at http://www.periodicvideos.com/ Follow us on Facebook at http://www.facebook.com/periodicvideos And on Twitter at http://twitter.com/periodicvideos Periodic Videos films are by video journalist Brady Haran