Later,Alfred Wegener said the continents had once been part of a huge area of land he called Pangaea.

VOA: special.2010.01.12

Science on Tap meets once a month at a bar called the Schlafly Bottleworks.

VOA: special.2010.05.14

Once the water is heated, it is kept hot with material called insulation.

VOA: special.2009.04.20

The New York Times once called him "America's philosopher."

VOA: special.2010.01.07

He referred to criticisms once directed at the pop star for what some had called erratic behavior.

VOA: standard.2009.07.07

St.Louis has two science cafs. The second one - sponsored by Washington University - meets once a month during the academic year at a bar called the Schlafly Bottleworks.

VOA: standard.2010.05.04