If you're ready to jump-start the hydrogen economy, well, you might have to begin at 1/10th scale. Horizon Fuel Cell Technologies announced a kit that lets you convert an electric radio-controlled car to get its electricity from an onboard hydrogen fuel cell. Horizon's H-Cell system stores low-pressure hydrogen gas in three canisters. The fuel cell system offers the advantage of four times the range of conventional batteries, letting you run your little racer for 60 to 70 minutes. With a regular battery, you would have to put it on the charger after about 15 minutes. So if you're going to be racing the scaled-down version of the 24 Hours of Le Mans, you might want to look into this system.
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Here are some quick fixes for some of the most common problem in iOS 7.