Darwin had been working on his theory for over twenty years when he published " On the Origin of Species."

VOA: special.2009.12.01

When the water heater is working correctly, water will flow from the storage tank to the collector and back again.

VOA: special.2009.04.20

Miz Goodall says when she began working in Tanzania, there were between one and two million chimps in the wild.

VOA: special.2009.11.18

In the late nineteen nineties, the Canadian professor was working in Nepal when his return flight was canceled.

VOA: special.2009.12.21

The American Bar Association's Committee on Judicial Independence is working on guidelines for when judges should recuse themselves.

VOA: special.2009.06.12

For example, the reporter Nellie Bly was working for him when she investigated the cruel treatment of patients at a mental hospital.

VOA: special.2009.04.20

They plan to continue working on it until the end of October when it will be taken apart.

VOA: special.2010.08.13

When Doctor Levi-Montalcini was a young woman, she dreamed of working in Africa with Doctor Albert Schweitzer.

VOA: special.2009.05.13

Water is needed for cooling the body on hot days, and when we are working or exercising.

VOA: special.2010.07.27

He became very wealthy. When he was not working, he was in a local hotel playing card games for large amounts of money.

VOA: special.2010.03.17

He said: "When I saw hard-working people suffering under debts, sickness and worries, I knew there was plenty to make up songs about."

VOA: special.2010.06.13

He was still working in Big Piney,Wyoming, when he died of a heart attack on January fifteenth.

VOA: special.2009.02.23

Since then officials have been reported working on final guidelines for when schools should close.

VOA: special.2009.08.05

Nathan plans to keep working on that goal when he completes the second year of his fellowship with the children at PS 75 in Brooklyn.

VOA: special.2011.07.11