Why is health care so expensive?
An immune system trained to kill cancer
Why some languages sound so fast
Keyboard heat maps for different languages
WinRT and .NET
Magic square with a twist
Tiling a triangle with congruent triangles
Famous curves index
Evolution of the normal distribution
Graduate algebra course notes from J. S. Milne
What is fire?
typo in the Curves link there, should be: http://www-history.mcs.st-andrews.ac.uk/Curves/Curves.html right ?
Pretty cool video on fire. It still doesn’t answer the ultimate question: “what is fire?”
Some emerging research does though. Fire is composed of millions of tiny diamonds. I thought it was a rather poetic result, so thought I’d share.
Long-time reader, first-time commenter… This is my favorite blog!
I always like where special curves show up, like learning that the cycloid is the path of fastest time from A to B under gravity, or the catenary describes the shape of a rope hanging from the top of two equal height poles. One I just learned about is the involute (that isn’t mentioned at the involute link) is its application in gears, specifically gear meshing. When gears mesh, in order to have smooth transfer of angular speed from one gear to another (that is, so that the gear that is being driven by the other turns as smoothly as the driving gear without lurches or acceleration), the curve on the teeth of the gear has to be an involute. Wikipedia has the goods here.
One I just learned about is the involute (that isn’t mentioned at the involute link) is its application in gears, specifically gear meshing.
John D. Cook
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