Professor Robinson says it is not clear when the first marriage between a black person and a white person took place.

VOA: special.2010.09.03

The scientist says this mission has been planned for many years, but he is not sure when it will happen.

VOA: special.2010.05.25

When it is cooked at a very high temperature, the glass pieces melt and take the shape of the clay form.

VOA: special.2009.09.16

And when the system fails, it is my responsibility." President Obama campaigned on a promise of "change we can believe in."

VOA: special.2010.01.23

Huck's heart leads him to do the right thing, even when everything he has been taught tells him it is wrong.

VOA: special.2010.03.21

But the look on everyone's face, when you are finished and packing, it is the best smile in the world;

VOA: special.2009.03.22

When it is cold outside, the president and his family can warm up near one of the White House's twenty-eight fireplaces.

VOA: special.2009.05.08

She says all climbers go to these centers in the winter when it is too cold to climb outdoors.

VOA: special.2009.12.09

The driver follows the directions and makes turns based on sounds that the steering wheel makes when it is turned.

VOA: special.2009.11.03

In time,they said, the moving ocean floor is blocked when it comes up against the edge of a continent.

VOA: special.2010.01.12

When you are out in nature it is important to speak softly so as not to frighten the animals away.

VOA: special.2009.08.19

When it reaches the brain, levodopa is changed into dopamine, the chemical that is lacking in people with the disease.

VOA: special.2009.04.07

It is cut to the chase. She heard that expression when she attended an important meeting of one company.

VOA: special.2010.07.25

"I'm all about words. And when it comes to words, poetry is at the top of my list.

VOA: special.2009.10.12