When she was finished, she counted the money out to the waiter and left an extra coin on his tray.

VOA: special.2009.09.05

On an acoustic guitar, the strings vibrate and the hollow part of the instrument, or the sound box,also vibrates.

VOA: special.2009.09.27

We see this sign on drug stores and whenever we visit a doctor to get an order for medicine.

VOA: special.2009.03.22

The two sides agreed quickly on the issue of Cuban independence, and an American takeover of Puerto Rico and Guam.

VOA: special.2010.07.22

It can do this between sunrise and noon on a clear day with an average outside temperature of thirty-two degrees Celsius.

VOA: special.2009.04.20

Some cities and communities will hold Earth Day activities and celebrations for an entire week, not just on April twenty-second.

VOA: special.2010.04.21

An international agreement on protecting endangered animals and plants provides for sport hunting of white rhinos in Africa.

VOA: special.2009.12.14

Lack of empathy has an influence on borderline personality disorder, narcissism and psychopathy and the developmental disorder autism.

VOA: special.2011.08.10

And,they provide an interesting commentary on how America's government,people, and artists have chosen to represent their history.

VOA: special.2010.01.27

Stephanie Rickard is an expert on the IMF and World Bank at the London School of Economics.

VOA: special.2011.05.20

The monkeys that ate fewer calories look younger and healthier than fatter monkeys on an unrestricted diet.

VOA: special.2009.09.01

Doctor Bernadette Daelmans is an expert on newborn and child health development for the World Health Organization.

VOA: special.2010.08.04

She went on to become an English teacher, librarian and girls' basketball coach at Jay Allen High School in High Point, North Carolina.

VOA: special.2009.03.29

His specialty was representing the effect of light on an environment with color and loose brushstrokes.

VOA: special.2010.08.04