Sean Carroll did it in 420 characters:

http://twitter.com/#!/seanmcarroll/status/68741225250963456

http://twitter.com/#!/seanmcarroll/status/68741443379920896

http://twitter.com/#!/seanmcarroll/status/68741774100799488

(Background: http://blogs.discovermagazine.com/cosmicvariance/2011/05/13/...)