Alien Visits

Q: Why haven't aliens visited our solar system?
A: They checked the reviews and we only have one star.

Sun College

Q: Why didn't the sun go to college?
A: It already had a million degrees.

New Millennium

Recently, on an outing with my scout troop, the question came up of whether the new millennium began January 1st, 2000, or 2001.
The Scoutmaster explained that each century begins with year "1" and ends with year "100" —  the 20th century began at the start of 1901 and ended at the close of 2000.
To illustrate his point, the Scoutmaster gathered 15 berries and asked the boys how many he had. Each boy correctly answered "15".  
"Now which berry is number '0'?" He asked next, to which one boy blurted out:
"The one that isn't there!"