The Pigeonhole Principle for Kids: Why Two Pigeons Must Share

The story of the pigeonhole principle for kids: why two people in London must have the same number of hairs on their heads, and how Peter Dirichlet set out the rule in 1834.
• Why more pigeons than pigeonholes means two must share
• How a French puzzle book used the hairs example back in 1622
• Why any 13 people include two born in the same month
• Quiz questions to answer along the way
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