## Thursday, February 23, 2017

### Couldn't Resist

From Monica Calabi via Junk Charts via Wired. Of course, this is prone to the dimensional problem we've seen before.

## Friday, February 3, 2017

### Post Modern Bell Wear

Watch a fun video The Evolution of Tap Dance by Post Modern Jukebox with tap dancer Sarah Reich. Note the bell-shaped distribution pattern of wear on her tap platform: most wear in the middle and less towards the edges.

## Monday, December 19, 2016

### Self-Referential Santa

Futility Closet offers Raymond Smullyan's self-referential proof of the existence of Santa Claus:
A: Santa Claus exists, if I am not mistaken.
B: Well, of course Santa Claus exists if you are not mistaken!
A: So, I was right.
B: Yes.
A: So, I was not mistaken.
B: Yes.
A: Hence, Santa Claus exists.

## Monday, October 31, 2016

### Stepping Up

This is a ladder leading to an elevated playhouse for kids visiting Brookside Gardens in Maryland. The ladder reveals a frequency distribution of foot placement wear. On most steps we see more wear in the middle of the ladder rung and less wear towards the left and right edges. This leaves a bell-shaped pattern of use.

But a rung near the bottom has a bi-modal pattern, showing the wear resulting from both left and right feet. This doesn't persist on higher rungs. There the wear seems more central. So why not on the lower rung as well? Perhaps central steps on higher rungs feel safer. A care that is not that needed closer to the ground.

## Monday, October 24, 2016

### Guitar Fret Wear?

Here is an image from imgur of the fret board on a 1956 Fender Stratocaster guitar showing the frequency distribution of playing wear (thanks Scott). But many on Reddit disagree, calling it faked. Not being a guitar player, I can't judge. What do you think?

## Monday, October 17, 2016

### Fair, Minimal Symmetry Dice

Mathematician Henry Segerman demonstrates his 3D printed skewed or squished six-sided dice. He states "they work like ordinary dice". He exploits 3D symmetries to produce these isohedral dice with "just enough symmetry to be fair". Check out his video above and links to his extra footage.