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I go up, Though sometimes I am down. I can write, But I don't make a sound. I am the touchstone for lightness, But often I am black. I can help you to hit the sack.
A bartender has a three pint glass and a five pint glass. A customer walks in and orders four pints of beer. Without a measuring cup but with an unlimited supply of beer how does he get four pints in either glass?
A tool stolen but still must be made, used to explore, protect, and create. What am I?