From Pepsi to Peace Deals by Rob Eastaway A famous Coca Cola advertisement used the line "I'd like to teach the world to sing in perfect harmony". Yet Coca Cola and Pepsi have been competing viciously with each other for decades. Collaboration and competition are everywhere around us, and mathematics and game theory can tell us a lot about why peace, harmony and love are not quite as easy to achieve as the songs might suggest. Rob's Biog Rob Eastaway is an independent lecturer and author whose books on everyday maths include Why do Buses Come in Threes?, Beating the Odds and How Many Socks Make a Pair?. For several years he set puzzles for New Scientist and The Sunday Times, and he is often to be heard on radio talking about the maths of everyday life.

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