I was surprised to see that Google has a calculator built-in. It can also
do calculations with units...

For the ones suffering from conversion pain (as the USA is moving slowly
but steadily to join the rest of the world on the metric side), maybe it
helps every now and then.

Try http://www.google.com/search?q=2+hours+*+40+btu+%3D
Or http://www.google.com/search?q=20+miles+in+km

It's not too smart with units... for example it doesn't seem to know how to
use US antique units for torque (lbf in, in lbf, lb in, in lb, etc. :) and
force (lbf for example). But some things still work.

Gerhard
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