[Responsibility2nd]

2. What is lighter than a feather but the strongest man in the world can not pick up?

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I know this one! Your shadow.

[Lazamataz]

I said air. There are lots of things: You could say ‘electron’ too, because you cannot pick up a single electron

[Alas Babylon!]

Good. I was gonna say Thor’s hammer. But his sister blew it up.