Google calculator. Natural language parsing and calculation. Very cool.

For instance, did you know 1 cubic parsec = 2.93800656 × 10E79 cubic angstroms? Or that there are 6.04800 × 10E20 femtoseconds in a week? Or 2.21163264 × 10E28 acres in a square lightyear?

Type "microns in five miles" in to a google search, and it happily tells you there are 8046720000. Neat.

pca
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Experience is what you get just after it would have helped...