Flat tires may soon be a thing of the past, said Stephen Shankland at CNET. At the Paris Motor Show last week, Bridgestone unveiled a prototype of its Air Free tire, which replaces conventional tires' cushion of air with "an array of shock-absorbing resin bands that resemble thick, angled spokes." The outside of the tire, which is completely recyclable, is lined with a replaceable tread made of a thin band of solid rubber. Bridgestone says the current prototype is still "too stiff," which is bad for steering, but it hopes to resolve that issue in testing.