1.   When astronauts return to Earth, the vessels relax but the blood volume remains low, so there is a limited blood flow to the brain.

2.   Traders warned the market was still perturbed, with volume low as investors held back ahead of the release of key U.S. economic data tomorrow.

3.   Worries about rising interest rates hung over the market, keeping volume low and buyers scarce.

4.   Dealers coming back from a long holiday weekend kept trading volume low and analysts said the main upward push on shares came from technical corrections to the fall Thursday.

5.   The dollar was steady at midday in New York with volume low because of the coming Christmas holidays and heavy snows that paralyzed New York.