$20 QUESTION -- Category: Energetic Terms

What is "R-value?"

  1. A measure of the effectiveness of insulation -- the higher the number, the better the insulating properties.

  2. A measure of how clear a window is -- the higher the number, the better you can see through the glass.

  3. CBS-TV's answer to "The X-Files" -- a new series that features three teenage psychic investigators living at the beach.


 Click on the answer you think is correct!