Readers can better understand how informed consent and the question of morality in medical experiments have changed over time.

VOA: special.2010.07.21

This week,our subject is mothers and how their image has changed over the years in film and television.

VOA: special.2009.05.04

It cannot be changed. The expression comes from the idea that water that has fallen over a dam cannot be brought back again.

VOA: special.2009.05.10

But over the years, the sign changed from the eye of Horus to the sign for Jupiter, the chief god of the Romans.

VOA: special.2009.03.22

And he said her pioneering work for social and scientific improvements changed the lives of millions of developmentally disabled people all over the world.

VOA: special.2009.08.23

He changed it. Lincoln ordered Vallandigham to be turned over to the Confederate army.

VOA: special.2009.10.29

Elizabeth Custer believed the name changed over time to mean the soldiers themselves.

VOA: special.2010.03.07

Over the years, the kinds of criminals on the list have changed.

VOA: special.2010.05.05

Over the years, Loisaida has changed.

VOA: special.2009.04.27

These iconic household goods have changed over the years, from wristwatches, radios and bicycles, to refrigerators and televisions.

VOA: standard.2009.09.28

and that social norm is just something that's changed over time." And people share a lot.

VOA: standard.2010.07.23

But the look of this commercial zone has changed over the last three years.

VOA: standard.2009.12.20

And things have changed over the last generation or two.

VOA: standard.2010.07.14