The Detroit leaks continue, with the Saab 9-4X BioPower the latest to break out of the darkness. These leaks are coming before the Detroit Auto Show kicks off in a few days. But did you expect Zap electric cars to make an appearance at Macworld later this month? Neither did we. And here's another question: Who knew ideas for wooden cars have been around since 1495? Leonardo da Vinci, that's who. His contraption has was brought to life a while back, and we've got a nice video of the car in motion.

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