Recently I have become quite the fan of riddles and brainteasers (some people in the barracks are calling me the Riddler) Thought I'd post em here. I will post at least one a week here. If someone thinks of the answer, I'll let em know they got it right and post the next riddle/brainteaser. If no one gets it, than after one week I will post the answer and a new one
Riddle me this.
What can be sold, but never bought? Everyone has it, but no one knows how much. To be extended, it must first be shortened.
What is it?