The National Education Association, the country's largest teachers union, gives a history of the celebration on its Web site.

VOA: special.2010.04.30

Scientists think the largest dinosaurs would have to have spent thirty hours a day chewing and swallowing their food.

VOA: special.2010.06.04

Aides to President-elect Barack Obama have been negotiating with Congress on a 2-year recovery plan for the world's largest economy.

VOA: special.2009.01.16

In a place called the Mariposa Grove, visitors can see some of the largest, tallest and oldest living things on Earth.

VOA: special.2009.01.07

Late Thursday, the government released the results of a special examination, so-called stress tests, of the nineteen largest banks.

VOA: special.2009.05.08

He says Harpers Ferry was a noisy,dirty, polluted industrial city in what was then Virginia, the largest slave state in America.

VOA: special.2009.11.06

A new report this week from China showed that its economy became the world's 3rd largest in 2007, passing Germany.

VOA: special.2009.01.16

Ms.Skariah is teaching Indonesians but also learning about the culture of a country with the world's largest Muslim population.

VOA: special.2011.03.28

The world's largest drug company has agreed to pay almost two and a half billion dollars for illegal marketing of medicines.

VOA: special.2009.09.11

It was the largest seaport. It had become a busy industrial center, producing war equipment for Confederate forces.

VOA: special.2009.09.10

Last month the World Bank predicted a 2% decrease this year - the largest drop since the 1940s.

VOA: special.2009.01.16

In Europe,reports last week showed a year of recession easing in Germany, its largest economy,and in France.

VOA: special.2009.08.21

Diana Atieno Tujuh volunteers as a teacher at the Saint Christine's Community Center in the Kibera slum, one of the largest in Africa.

VOA: special.2009.08.24

His largest project was a series of buildings that would become the government center of Dhaka,Bangladesh.

VOA: special.2009.12.13

But this week, Mr.Obama could report apparent success in a different sort of battle -- against the largest accidental oil spill ever at sea.

VOA: special.2010.08.07

The park has one of the world's largest outdoor sculptures, a ten-ton creation by Anish Kapoor.

VOA: special.2009.01.12

Last week,Dubai's largest investment company called for a six-month delay in paying some of its debts.

VOA: special.2009.12.04

Hispanics are now the nation's largest ethnic minority, and a fast growing group of voters.

VOA: special.2009.05.30

Yet a study released Thursday said men still hold about nine out of every ten top positions at the four hundred largest companies in California.

VOA: special.2009.11.20

The settlement is the nation's largest ever in a case of health care fraud.

VOA: special.2009.09.11

And the largest amount for a team was almost one hundred fifty thousand.

VOA: special.2009.11.02

The bankruptcy is America's fourth largest, but the largest for a manufacturer.

VOA: special.2009.06.05

A ten-billion-dollar deal aims to create the world's largest exchange company.

VOA: special.2011.02.18

The largest is Burlington, a city of 38,000 people in Vermont.

VOA: special.2009.01.05

Yet,a recent survey by YouGov, Britain's largest polling organization, found that 58 percent of people surveyed associate Islam with extremism.

VOA: standard.2010.07.19

Coming from the world's fourth largest wheat producer, this report contributed to a 25-percent spike in world wheat prices in July.

VOA: standard.2010.07.23