I use this page to create LaTeX math images for random things. See Help:Formula for documentation.
2.7 miles = 1.35 hours
1 lb = 453.59237 g
penny = 2.5g = 250 g/$
= 0.551155655 lb/$ * 1.35 cal/lb*day
= 0.74406013425 cal/$*day
Value-density of a penny:
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Energy used carrying a penny around for a day:
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For http://plutor.org/blog/2006/02/15/when-is-powerball-worth-it/
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