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They may not be Sonny and Cher, but certain South American birds sing duets, taking turns as the tune goes along.
The early French settlers left a permanent mark on the Canadian region of Quebec, new research shows.
Senators announced a bipartisan plan Wednesday to help keep the financially ailing Postal Service solvent and continue six-day mail delivery for at least two more years.
Should the anthrax vaccine be tested in children? It will be a while longer before the government decides.
Winter looks to be cold and wet across the northern tier of states, and the drought will worsen in the South, where conditions are expected to be warmer and drier than usual, government forecasters said Thursday.
It'll cost a penny more to mail a letter next year.
The post office's largest union said Sunday it is hiring its own financial consultants to study the future of the financially strapped agency.
Mom might get a quick note in the mail. Sister might get a birthday card. But that's about it. For the typical American household these days, nearly two months will pass before a personal letter shows up.
Who would you put on a stamp? Charlie Sheen? Lady Gaga? Yourself?
The outlook for the next three months is bad news for drought-plagued Texas and its neighbors.
In science fiction, amber preserved the DNA that allowed rebirth of dinosaurs in Jurassic Park. In real life, amber preserved feathers that provide a new image of what dinosaurs looked like.
President Barack Obama says the U.S. Postal Service should be allowed to reduce mail delivery to five days a week to help cut its massive losses.
Imagine a nation without the Postal Service.
Two million-year-old bones belonging to a creature with both apelike and human traits provide the clearest evidence of evolution's first major step toward modern humans — findings some are calling a potential game-changer.
The version of plague that caused the Black Death in 14th century Europe may now be extinct, researchers report, but other deadly forms remain in circulation today.
A spike in radioactive sulfur from the damaged Japanese nuclear plant was detected in California in late March, but researchers say it posed no threat to health.
One day monitoring a patient's vital signs like temperature and heart rate could be a simple as sticking on a tiny, wireless patch, sort of like a temporary tattoo.
The remains of a giant sea creature are providing the first proof that these prehistoric reptiles gave birth to their young rather than laying eggs.
Sweltering may have reached a new record last month, as Oklahoma racked up the country's highest monthly average temperature ever.
The financially strapped U.S. Postal Service is considering cutting as many as 120,000 jobs.
The U.S. set a record for the most tornadoes within a month with April's deadly storms.
From sea otters to blue whales, marine mammals are under stress from climate change, ocean acidification, hunting and other threats. Researchers have identified 20 important sites around the world where they say conservation efforts should concentrate.
The authors of a widely reported study that offered an early glimpse into factors leading to long life are withdrawing the paper because of problems with some of the data they used.
The killer lurking in the shadows of the current heat wave may be hot nights.
The Postal Service is considering closing more than 1 in 10 of its retail outlets.
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