She was nineteen. Those who knew Ida Tarbell in college say she would wake up at four o'clock in the morning to study.

VOA: special.2010.04.25

It was a little before one o'clock in the afternoon when Paul arrived at the Waldorf-Astoria hotel.

VOA: special.2009.04.11

The team was looking for a natural clock in the body that controls sleep and wakefulness.

VOA: special.2009.08.26

When I had made an end of these labors, it was four o'clock in the morning.

VOA: special.2009.05.16

A little past one o'clock in the afternoon, a Confederate gun fired,once.

VOA: special.2009.11.05

It was four o'clock in the afternoon when Paul woke up.

VOA: special.2009.04.11

Then he attacked. It was six o'clock in the evening.

VOA: special.2009.10.15

He began developing his clock in seventeen thirty.

VOA: special.2010.07.14

It's four o'clock in the morning and the 68-year-old fisherman is dragging a plastic trunk of fish carcasses across the dock toward his boat.

VOA: standard.2010.07.20

This man said at about five o'clock in the morning, he heard the dam collapse and all of sudden the water rushed towards the houses.

VOA: standard.2009.03.27

"Three or four hours before I could fall asleep. I wake up three o'clock in the morning with the same stuff on my mind, tossing and turning.

VOA: standard.2010.05.04

The clock could tell the correct time in two places, meeting the requirements for learning longitude on the sea.

VOA: special.2010.07.14

Behind her,in the little room over the porch, a tiny clock ticked loudly on its shelf near the end of the bed.

VOA: special.2010.05.15

Two years later, in seventeen fifty-seven, he produced a small clock that he could hold in his hand.

VOA: special.2010.07.14

For the study, an independent high school in Rhode Island delayed morning classes from eight o'clock to eighty-thirty.

VOA: special.2010.07.07

Last August,a study in the journal Sleep Medicine said children who go to bed after nine o'clock took longer to fall asleep and slept less.

VOA: special.2010.06.09

Mister Harrison had to develop a clock that was not affected by the movement of a ship on the ocean or changes in temperature or atmospheric pressure.

VOA: special.2010.07.14

Lawmakers are working against the clock, with a month-long recess scheduled to begin in a matter of days.

VOA: standard.2009.07.28

"Memorial should not dictate to us what we do in our own time, off the time clock."

VOA: standard.2010.02.18

It will house 8,000 people in tents. Fifty security guards will be on duty around the clock.

VOA: standard.2010.03.29

but she has not had the best of luck in the romance department and, with her biological clock ticking away, she has decided the "right guy" may never show up.

VOA: standard.2010.04.30