Rewriting What’s Possible in the Mountains

Kilian Jornet wanted to summit 72 of the tallest peaks in the contiguous United States. He gave himself a month to do it.
Scientific American

This New Shape Breaks an ‘Unbreakable’ 3D Geometry Rule

Can you drill a hole in a cube that an identical cube could fall through? Prince Rupert of the Rhine first asked this ...
Quanta Magazine

First Shape Found That Can’t Pass Through Itself

To see how one cube can pass through another, imagine holding a cube over a table and examining its shadow (assuming it’s ...
Investopedia

Three Sigma Limits Statistical Calculation With Example

Three sigma limits are used ... control limit is set at three sigma levels below the mean. Standard deviation is a statistical measurement. It calculates the spread of a set of values against their ...