Hector Martin wrote:

> As an aside, I've found Google to be a very good aid when doing 
> technical calculations like these, not only because it auto-handles 
> units (which is useful but can get strange sometimes), but because if 
> you mess up the units anywhere it will either not return an answer or 
> give out the wrong units.

Which is of course a general advantage of doing calculations with the
proper units throughout (including conversion factors). In many cases,
you'll see immediately when something is wrong. I'm glad that I was
introduced to physics in high school this way and have it done like this
ever since.

Gerhard

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