Updated Math of Beauty interactive
By Murray Bourne, 14 Jan 2014
This one's a bit of fun and not overly scientific.
Why is it that we tend to regard certain people as beautiful regardless of their (or our) race or skin color? Some people feel this is because we are attracted to people whose faces are symmetrical and who follow certain geometric shapes, especially those based on Fibonacci ratios.
This page has always been one of the most popular on IntMath. I updated it so it also works on tablets and (large?) smart phones.
Skin deep? On the page, I have a disclaimer that says "inner beauty is more important than external beauty."
For the geeks
This interactive used to be Flash-based, but of course Flash doesn't work on mobile devices.
See the 1 Comment below.