1.   A number of theories have been advanced to explain the regional differences, Jaffe of the CDC said.

2.   All sorts of sober sociological theories could be advanced to explain the anguished turmoil of adolescence.

3.   In the absence of any explanation from government or bank officials in Orissa, several theories have been advanced to explain why the ashes were left in the bank.

4.   One explanation advanced to explain the recent snowy winters is El Nino, a warm-water current off the west coast of South America.

5.   Southern homicide was typically rural, and over the years many theories have been advanced to explain it.

6.   This development is so odd that dozens of competing theories are being advanced to explain it, each with some validity but none sufficiently conclusive to resolve the mystery.

7.   Unfortunately, every theory that scientists have advanced to explain the deformities seems unable to explain such a variety of deformities over such a large area.