Math is usually seen as a tool in the US rather than part of curiosity and even excitement. There have been exceptions. For years Martin Gardner's Mathematical Games column ran in Scientific American inspiring many to play with math often without needing a deep background.

a tip of the hat to Barb

Scientific American also ran C.L. Strong's *Amateur Scientist* column for years - effective a gateway drug to professional science for thousands as well as the basis for basement science.

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For some the joy of math has been reflected in the design of their home - James Stewart's house near Toronto is for sale.

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The Canadian mathematician made a multimillion-dollar fortune by writing calculus textbooks for universities and high schools. Last year alone he sold 500,000 books, accounting for about $26.6m (£17.5m) in sales, according to his estate.

Stewart was also an unlikely architectural trailblazer. He devoted many years of his life, and much of his income, to building his dream home in an upmarket Toronto neighbourhood. Integral House – named after the “integral”, a concept in calculus – is a shrine to calculus, the mathematics of flowing change.

Stewart died last December, aged 73, and Integral House is now for sale at £11.4m .

“The house is a piece of art,” said Paul Maranger, of Sotheby’s International Realty. “When buyers go into the house the first reaction is a sense of awe.”

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