Sensible Units converts normal units of measurement into equivalent real life objects. Don't know how accurate it is but it could be interesting to test out some of the smaller units to see just how 'real' the actual conversions are.
Interestingly, each time you choose a measurement Sensible Units presents you with a random selection from their set of answers. You can also view all of the answers if the ones presented don't help - just select the 'Show all' tab.
I like this one. Thanks Amit.
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