Like a ship approaching a distant beacon, astronomers are getting closer and closer to the cosmic dawn, the time in the universe's history when the first stars formed.
A single gene, inserted into the apex of the heart, can convert normal cardiac muscle cells into those that control its electrical function, a study found.
Giving a bit of sugar to a baby about to get a shot might reduce the pain, a large review of studies suggests.
Little Miss Muffet could have been separating her curds and whey 7,500 years ago, said a study that finds the earliest solid evidence of cheese-making.
Tobacco use has declined sharply since the 1960s, but for the past 20 years about 20 percent of the population has continued to smoke -- despite the imposition of steep tobacco taxes in many states.
CAPE CANAVERAL, FLA. - The military's top-secret version of the space shuttle was launched into orbit on Tuesday for a repeat mystery mission, two years after making the first flight of its kind.
A new study links even small reductions in fine particle air pollution to increased life expectancy. Researchers who compared data from 545 U.S. counties found that a drop in fine particulate matter, known as PM2.5, between 2000 and 2007 corresponded with an average rise in life expectancy of 0.35 of a year. The study, led by researchers at the Harvard School of Public Health, is described as the largest to date to find public health benefits from ongoing reductions in U.S. air pollution levels.
The U.S. birthrate plunged last year to a record low, with the decline being led by immigrant women hit hard by the recession, according to a study by the Pew Research Center.
An area of Arctic sea ice bigger than the United States melted this year, according the U.N. weather agency, which said the dramatic decline illustrates that climate change is happening "before our eyes."
Despite early cooling from La Nina, 2012 is on track to become one of the top 10 hottest years on record, with the U.S. experiencing extreme warmth and Arctic Sea ice shrinking to its lowest extent, the U.N. weather agency said Wednesday.