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In skimming, spin's the thing
Find out how to beat the world record in stone skimming - you just need to do the maths!
Nineteenth-century German mathematician Leopold Kronecker once said God created the integers, all the rest is the work of man.
What tactics should a soccer player use when taking a penalty kick? And what can the goalkeeper do to foil his plans? John Haigh uses Game Theory to find the answers, and looks at his World Cup predictions from last issue.