A few years ago, I lost my passport two days before a big, international trip. Getting a new passport expedited would cost hundreds of dollars. And I wasn't sure if it would even arrive in time. You ...
In 1876, Peter Guthrie Tait set out to measure what he called the “beknottedness” of knots. The Scottish mathematician, whose research laid the foundation for modern knot theory, was trying to find a ...
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