Mothers may also be under some misperceptions about how much milk newborns need.

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And speaking of resemblances, Kronenberg says she was shocked by how much Milk star Sean Penn looked like her former boss.

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Other San Franciscans are likely to think about how much their city has changed as the new movie Milk opens this week.

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Using this, people can add items such as particular brands of eggs, milk, and the like, and see how much those items will cost.

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Or consider how much easier it got to earn the money for a half-gallon of milk (56 minutes in 1900, down to 31 minutes in 1930) or 100 kilowatt hours of electricity (107 hours in 1900, but only 11 hours in 1930).

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