The Roman historian Pliny said that Phoenician sailors accidentally discovered how to make glass over three thousand years ago.

VOA: special.2009.09.16

She shows how Darwin came to understand that these island animals had differences, developed over time, that helped them survive.

VOA: special.2009.02.27

He told her his ideas about how species evolve over time -- what he called the transmutation of species.

VOA: special.2009.02.25

He says looking back thousands of years can help researchers look forward by understanding how a disease changed over time.

VOA: special.2010.06.29

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

VOA: special.2010.07.21

Professor Auerbach describes how the evolution of vampires tells a great deal about a culture's fears, which change over generations.

VOA: special.2010.01.20

Charles Darwin developed the theory of how living things develop from simpler organisms over long periods of time.

VOA: special.2009.02.25

Mr.Kristof and Ms.WuDunn explain how all over the world women are subjected to violence, sexual slavery and other forms of severe oppression.

VOA: special.2010.06.16

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

VOA: special.2009.05.04

He discusses how scientists over the years have identified the experience and developed theories to explain it.

VOA: special.2010.02.24

The unusually long period of cold weather has shown how even warm climates can sometimes freeze over.

VOA: special.2010.01.12

It shows how Chinese communities developed all over the American West more than a century ago.

VOA: special.2010.07.23

the saying goes. But the debate over net neutrality could define how free the exchange of information is going to be in the future.

VOA: special.2009.09.25

The FBI has studied how "Top Ten" criminals have been caught over the past twenty years.

VOA: special.2010.05.05