Some Coincidences

http://commons.wikimedia.org/wiki/File:537521main_earth_pacific_full.jpg

There are almost exactly 500 million inches in the pole-to-pole diameter of the earth.

The speed of light is within 0.1% of 300,000 kilometers per second.

A cube with a side of 1 mile has nearly the same volume as a sphere with a radius of 1 kilometer.

See Applied Math.

(Thanks, Ben.)