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Ele inventou o palito de fósforo em 1826 — uma das invenções mais usadas da história. Hoje o mundo consome mais de 500 bilhões por ano. Mas John Walker se recusou a patentear. Disse que fogo fácil era um direito, não um produto. Morreu sem dinheiro enquanto outros lucraram bilhões com a ideia dele. Neste vídeo, eu conto a história ...
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