The week in transportation: Plug-in milestones, Teslas, 3d-printed bikes, Sparks, stupid tweets, etc

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Tesla Model S
credit: Tesla Motors Events

It's Friday, the week is almost over. Time to look back at some highlights from this week in transportation!

The first story that received a lot of publicity is about Tesla Motors - a company famously called a "loser" by some politicians - repaying the Department of Energy loan that it received 9 years ahead of schedule.

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