Smale's paradox
The red dusty hairs of the capsules of an East Indian tree (Mallotus philippensis), used for dyeing silk and in the treatment of tapeworm.
Alternative form of didicoy
(topology) The non-intuitive fact that it is possible to turn a sphere inside out in a three-dimensional space with possible self-intersections but without creating any crease.
A surname.
球を自己交差させながらも折り目を作らずに三次元空間で裏返すことができるというトポロジー上の非直感的な事実は、多くの数学者を驚かせました。
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