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For a long time, we’ve believed that the human appendix was more or less good for nothing.
Appendicitis? Human Appendix Maybe Not Useless After All
Eat, Drink and Live Forever: Immortality is 20 Years Away
Digital Drawing Board Creates Objects in Stunning 3D Detail
A knot diagram of the trefoil knot In topology , knot theory is the study of mathematical knots . While inspired by knots which appear in daily life in shoelaces and rope, a mathematician's knot differs in that the ends are joined together so that it cannot be undone. In precise mathematical language, a knot is an embedding of a circle in 3-dimensional Euclidean space , R 3 . Two mathematical knots are equivalent if one can be transformed into the other via a deformation of R 3 upon itself (known as an ambient isotopy ); these transformations correspond to manipulations of a knotted string that do not involve cutting the string or passing the string through itself. Knots can be described in various ways.

