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"Hybrids, diesels and electrics cost more than their gasoline-engine counterparts, but you may be able to save money over the long-term with better fuel economy. Compare the five-year ownership cost of green vehicles and their conventional equivalents (or any vehicle in the second drop-down menu) to see if you'll save money buying a green car. Then, since the vehicles you're comparing may take regular, premium or diesel fuel, input the price of fuel for each vehicle (our five-year calculations add 3.5% to fuel costs every year for inflation). Skip this step for electric vehicles - the fuel cost will be automatically calculated using average utility rates. Then, select the average number of miles you drive every year, and click the Submit button to see the results."

Why sharing is the inevitable next stage of the information revolution -- and how it's going to change everything from entertainment to Walmart.

An infographic from boston.com that shows where the US' debt has come from by presidential era and who holds the debt as of today.