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Just as square dance partners join hands at a particular point in the music, so broken pieces of DNA in our cells reunite as they are repaired. Precisely and quickly, these DNA pieces identify each other and tether together. A tumor-suppressor gene called ATM choreographs this fast-paced, but reliable, reassembly operation.

Along with all the other changes that come with age, healthy older people also lose some capacity for sleep. When asked to stay in bed for 16 hours in the dark each day for several days, younger people get an average of 9 hours of shuteye compared to 7.5 for older people, the researchers report.

Adult stem cells originate in a different part of the brain than is commonly believed, and with proper stimulation they can produce new brain cells to replace those lost to disease or injury, a new study has shown.

Due to considerable risks associated with the pesticide carbofuran in food and drinking water, the U.S. Environmental Protection Agency is revoking the regulations that allow carbofuran residues in food. EPA is proceeding on the path toward cancellation of the pesticide registration, which will address the risks to pesticide applicators and birds in treated fields.

Rigid parenting appears to be linked to increased sexual activity in older teens. More than two of every three American teens has sexual intercourse before age 19. Although it is difficult to confirm that controlling mothers and fathers cause kids to have more sex, the findings suggest it is wise to give children freedom.

Researchers have found that sorafenib (Nexavar) helps patients with advanced liver cancer live about 44 percent longer compared with patients who did not receive the anti-cancer drug. The findings are a significant advance in the management of liver cancer, which is the third cause of cancer death globally, often resulting in death within a year of diagnosis.

Two new research studies have discovered a long sought molecular link between our metabolism and components of the internal clock that drives circadian rhythms, keeping us to a roughly 24-hour schedule.

Scientists can now make the antifreeze protein that enables billions of Canadian snow fleas to survive frigid winter temperatures. Their laboratory-produced first-of-a-kind proteins could have practical uses in extending the storage life of donor organs and tissues for human transplantation, according to new research.

Age may not be rust after all. Specific genetic instructions drive aging in worms. This discovery contradicts the prevailing theory that aging is a buildup of tissue damage akin to rust, and implies science might eventually halt or even reverse the ravages of age.

Sports-related concussions in young athletes frequently go unrecognized, and often do not receive proper respect for the potential seriousness that even a mild injury may have, according to a pediatric sports medicine specialist. With more high-profile athletes describing their postconcussive symptoms, awareness is at an all-time high. An explosion in research about concussions in the past five years has increased understanding of how serious concussions may be.