A little thought

Hmm, here's an interesting thought: what does air smell like? Most people may say air is smell-less, but then, how can we really know? We've always "smelt" air our whole life. Can one compare the smell of air with the smell of no air? No, because without air, you can't breathe in, and then how would you smell? I think maybe the smell of air is the default smell in our nose, and that's why it's so oblivious to us. Take taste for example. Keep your tongue where it would normally be, touching the top of the inside of your mouth. Do you taste anything? Now try moving your tongue around, or tasting the bottom of the inside of your mouth. Feel anything different?