# Cool Websites

## Surface area of a cylindar and more!

Alicia Yeargin has a few excellent pictures for the math geeks. The first one is computing the surface area of a cylindar *snicker snicker* The second one is a nice little comic about bias: The third is something silly she wrote on her math test. She says: “An actual picture of a MAT140 test I …

## Sphericons

This is neat…. a sphericon is a 3-dimensional geometric solid with a single continuous face and two edges (sort of like a MÃ¶bius strip). The sphericon rolls along a wobbley path but ends up traveling in a straight line! Over at Fold Play, someone turned a pie into a sphericon – watch as it rolls …

## Coincidence? I think not!

Check out this neat website (inspired by some redditors back in the day). Basically the site shows two random graphs like the above example, where the first graph is “usage share of internet explorer” and the second graph is “annual deaths from tuberculosis“. Then people can vote whether it was a coincidence or not. The …

## “The Purple Nurple Optical Illusion” and more

Walter Anthony has some pretty neat optical illusions on his website. The one below is very cool and has been nicknamed the “purple nurple”: Another optical illusion I like (not sure who created this one) is the following:

## Math relationship search

This website let’s you search for your relationship to other mathematicians (assuming you have a Ph.D.).

## The first thing that should be shown in any Trigonometry class

Click to see it in action. (via Reddit)

## Shoe Lacing Math

How many ways are there to tie your shoes? Depends on the shoes, but Ian has done some calculations (under certain assumptions) to show there are over 2 trillion ways! Mathematician, Burkard Polster, published an article in the journal Nature (December 2002) about the mathematics of shoe lacing. His calculation for the number of ‘real-world’ …

## Another crackpot “mathematician”

There’s lots of crackpots on the internet (and off the internet) who don’t understand some of the basics in mathematics. This person claims that: “In 4,000 years of mathematics no one has been able to show a ratio for pi. We will show just how to produce that ratio. They state that pi is the …

## Antarctica Journal of Mathematics

Wow!Take a look at the website for the “Antarctica Journal of Mathematics”. Reminds me of the websites that flooded the net back in the 90’s. Yup, those stars are supposed to be flashing!! Link to journal. Link to reddit discussion about it.