Mathematicians have long wondered how “shapes of constant width” behave in higher dimensions. A surprisingly simple construction has given them an answer. In 1986, after the space shuttle Challenger ...

Mathematicians are “reinventing the wheel” by giving it a new shape. Their newly imagined wheel looks like a many-dimensional guitar pick, and it could theoretically roll in ways beyond our ...

If you’re a child of the ’80s or ’90s, chances are you’ve spent hours tracing out intricate patterns using the pens and gears of a Spirograph kit. Simple as those parts may be, they’re actually a very ...

Education and Training in Mental Retardation and Developmental Disabilities, Vol. 36, No. 4, Cumulative Author Index: 1991—2000 (December 2001), pp. 386-400 (15 pages) This investigation assesses ...

Bill Gates, billionaire and the co-founder of Microsoft Corporation (NASDAQ:MSFT), shared his approach to solving problems, ...