From: "Andrew Koenig" 
Newsgroups: misc.rural alt.home.repair misc.consumers.house
Subject: Re: They did it again!
Date: Mon, 19 Feb 2007 16:08:11 GMT

"Harry K"  wrote in message 
news:1171900226.274448.45640@s48g2000cws.googlegroups.com...

> The same problem as coins you can't tell by size.  You have to look at
> them each and every time.  Now you can't do much about paper bills as
> they will all feel the same no matter the denomination but there is no
> reason the dollar coin couldn't be made enough bigger than the quarter
> to be told by size.

There is, actually: It would then be necessary to change every vending 
machine in order to get it to accept the new size.

A penny and a dime are almost the same size, too, but they're easy to tell 
apart because a dime has a rough edge and a penny has a smooth edge.  At 
least the new dollar coins have smooth edges.