This could be bad

If you try to break a car window with a hammer, you’ll have a hard time, but if you throw a bit of porcelain from a spark plug at it with only moderate force, the window shatters. This is because porcelain (being a type of ceramic) is harder than tempered glass, but steel isn’t.

Occasionally I find myself setting my iPhone down on my iPad. Sometimes I gently toss it, because what the hell, it’s only plastic.

The iPad has a tempered glass screen.

The upcoming iPhone 4G is very likely to feature a ceramic back.

Uh oh.