What goes up but never comes down?

United States
November 27, 2007 1:56pm CST
This is a riddle.
4 responses
• Nigeria
26 Dec 07
Truth, No matter how long it takes, the Truth must be known one day
• United States
26 Dec 07
The answer is your age.
• Philippines
26 Dec 07
height. ?
@men82in (1270)
• India
6 Dec 07
Defenitely gas prizes.
• Poland
27 Nov 07
Tax ;)