Vitamin D is important for the absorption and metabolism of calcium, as well as for maintaining healthy bones and muscles.  It's important but different parts of America have varying levels of it, and that is the main source, so we fortify products like milk with it.

In Denmark, the sun is absent for much of the year so people generally have too low a level, but are consumers actually interested in buying foods with added vitamin D?

A team of paleontologists find in a new fossil study that the extraordinary regenerative capacities of modern salamanders are likely an ancient feature of four-legged vertebrates that was subsequently lost in the course of evolution.

Ivermectin, a workhorse of a drug that a few weeks ago earned its developers a Nobel prize for its success in treating multiple tropical diseases, is showing early promise as a novel and desperately needed tool for interrupting malaria transmission, according to new findings presented today at the American Society of Tropical Medicine and Hygiene (ASTMH) Annual Meeting.

Only 2 percent of Internet pages with information on firearm storage correctly identified all four practices that encompass safe gun storage.

In frontier days, gun safety was a given but in the modern era most kids don't grow up around guns - and movies contain a lot of gun violence without any real exposure to the consequences so children unfamiliar with firearms may regard them as toys or not realize that are loaded.

Women are more likely than men to have a bachelor's degree and a white-collar job. They are also more likely to earn less than male counterparts, finds a new study spanning two generations in the United States.

The scholars analyzed U.S. Census socioeconomic data of more than 180,000 people at two points in time. The study looked at Latino and Asian immigrants in 1980 and then at their children's generation 25 years later (in 2005), as well as non-Hispanic whites whose parents were not immigrants.

In 1980, men led women by a significant margin in bachelor's-degree attainment, white-collar jobs and earnings, the study found. This held true for all three groups: Asians, Latinos and whites.

A team of researchers have built the world's first sonic tractor beam that can lift and move objects using sound waves. Tractor beams can grab and lift objects, a concept that has been used by science-fiction writers and has since fascinated scientists and engineers.

Researchers have now built a working tractor beam that uses high-amplitude sound waves to generate an acoustic hologram which can pick up and move small objects.