Mail Experiments

I read this a few years ago but the link recently showed up on Digg and Boing Boing so I thought I'd post it here.  A group calling itself Improbable Research did experiments with the U.S. Postal Service testing the "delivery limitations".  They sent unusual items like a cow bone, a hammer, skis and recorded the results.  My favorite was the helium balloon, they wrote the address on it and argued it shouldn't need postage because it was lighter than air... 

Postal Experiments