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Hello there.

This is Numberphile. We mainly post videos about mathematics and just numbers in general.

The iPhone of Slide Rules

The iPhone of Slide Rules

Brady Haran
Alex Bellos, Tools, History

Thanks Audible: http://www.audible.com/numberphile

Alex Bellos discusses slide rules and then the Halden Calculex, which he describes as the "iPhone of Slide Rules"

Alex Bellos: http://www.alexbellos.com

Slide Rule Museum: http://sliderulemuseum.com

Purdue Libraries: https://www.lib.purdue.edu

Shapes and Hook Numbers

Shapes and Hook Numbers
Super-fast way to tie Shoelaces

Super-fast way to tie Shoelaces