Title: Wood.
Question: With the exception of earlywood/latewood difference in some types of trees, how much of an indication of strength is a wood's color?

Title: National Archives and Records Administration.
Question: What member of NARA has the ability to declare when the constitutional threshold of passage has ocurred?

Title: United States Air Force.
Question: How long does it usually take to be promoted from second to first lieutenant in the USAF? 

Title: Antarctica.
Question:
What location means that Antarctica get little solar radiation?