The Doppler effect (or Doppler shift), named after the Austrian physicist Christian Doppler, who proposed it in 1842 in Prague, is the change in frequency of a wave (or other periodic event) for an observer moving relative to its source. It is commonly heard when a vehicle sounding a siren or horn approaches, passes, and recedes from an observer. The received frequency is higher (compared to the emitted frequency) during the approach, it is identical at the instant of passing by, and it is lower during the recession.

On Monday, after a long quarter-century, West Virginians said goodbye to their state's 6 percent food tax. Now to see what, if any, business we've been missing. In 1989, retailers warned that sales in West Virginia would go down if legislators imposed a 6 percent tax on food. "Whatever they put on would be passed on to the consumer," Charles Forth, who owned supermarkets in both West Virginia and Ohio, told the newspaper in February 1989. "Six percent is $6 on $100. That will make a difference when people are already hurting and trying to make ends meet." It's a lot easier to drive customers away than to win them back, a fact legislators should bear in mind when it comes to taxation.

Six years ago, lawyer-banker-scholar Charles Morris wrote a prophetic book - 'Two-Trillion-Dollar Meltdown: Easy Money, High-Rollers and the Great Credit Crunch' - that foresaw the 2008 Great Recession before it clobbered America and the world. Now Morris has reversed course and sees good times ahead. His forthcoming book, 'Comeback,' predicts that surging U.S. energy independence will bring a buoyant rise in American manufacturing and jobs.

USS Gilliam (APA-57), named for Gilliam County in Oregon, was the lead ship in the her class of attack transports serving in the United States Navy during World War II. She was launched 28 March 1944 under a Maritime Commission contract by the Consolidated Steel Corporation, Wilmington, California; sponsored by Mrs. A. O. Williams of Wilmington; acquired 31 July 1944; and commissioned 1 August 1944, Comdr. H. B. Olsen in command.

Water polo, or water ball, is a team water sport. The playing team consists of six field players and one goalkeeper. The winner of the game is the team that scores the most goals. Game play involves swimming, treading water (using a sort of kicking motion known as "eggbeater kick"), players passing the ball while being defended by opponents, and scoring by throwing the ball into a net defended by a goalie. "Man-up" (or "power play") situations occur frequently. Water polo, therefore, has strong similarities to the land-based game of team handball.