White and full of air. Or, at least, that's what springs to mind when most of us picture the inside of these curious spherical creatures. However, how can we be truly sure? Who's to say that the insides are not black?
There you are, relaxing at home, surfing the internet, watching tv, microwaving yesterday's microwave dinner having forgotten how bad it was and just why you didn't finish it - when suddenly *pop* you're plunged into a world of darkness, leaping...