Scientific American: When I read that the soccer balls used for World Cup games have been specially designed for the climate in Brazil, that got me wondering – which climate? Brazil has many different climates. And are the players ready for a wide range of climates too?
Technically it’s winter in the Southern Hemisphere, but that doesn’t stop the heat or humidity in a place like Manaus, Brazil, at the heart of the Amazon rainforest. During Saturday’s match between England and Italy it was a sweltering 90 degrees Fahrenheit….

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