With gas prices higher than ever, and economists speculating that things are only going to get worse before they get better, it's not surprising that average Americans want to know why saying "fill 'er up" at the pumps these days may result in them being forced to sell a kidney on eBay in order to pay for it. While several factors come into play, the current price of crude oil, which is now around $50 a barrel, accounts for roughly half of the total cost of gasoline to consumers. About a quarter of the price we pay can be attributed...