[We are at the park. P is on the swings by herself – I am standing around, basically useless now that I only have to push once every minute or so.]
Mummy!
Yes?
You know how big a giant would seem to us?
Yes…
Well, that is how we must seem to a bird. And a bird would seem that big to an ant. And an ant would seem that big to a parasite. And a parasite would seem that big to a molecule. And a molecule would seem that big to a… NEUTRINO!
Hey, wait…
Yes?
Can you imagine how many neutrinos could pass through a giant at once without hitting even ONE of his atoms???
Whither Earthlings 