Em uma mesa, temos duas moedas aparentemente idênticas. Ambas mostram um lado com ‘cara’. Apesar de forma, peso e cor serem iguais, uma delas é genuína – ou seja, tem, de um lado, ‘cara’ e, de outro, ‘coroa’. A outra tem ‘cara’ dos dois lados. Nosso desafio é descobrir qual é qual.
Marco Moriconi
Instituto de Física,
Universidade Federal Fluminense
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