People’s long-term satisfaction with their lives often parallels that of their spouse, says a University of Toronto researcher in a study that deals a blow to theories that individual happiness depends mainly on genetic disposition.

Ulrich Schimmack of the University of Toronto at Mississauga’s psychology department and Richard Lucas of the University of Michigan studied the similarity in life satisfaction of more than 800 German married couples. They found that individuals’ reports of increased or decreased life satisfaction closely matched those of their spouses over a period of 21 years.

Supernovae stand out in the sky like cosmic lighthouses. Scientists at the Max Planck Institute for Astrophysics and at the National Astronomical Institute of Italy have now found a way to use these cosmic beacons to measure distances in space more accurately. The researchers have been able to show that all supernovae of a certain type explode with the same mass and the same energy - the brightness depends only on how much nickel the supernova contains. This knowledge has allowed the researchers to calibrate the brightness of supernovae with greater precision.

Johns Hopkins Kimmel Cancer Center scientists have found a set of "master switches" that keep adult blood-forming stem cells in their primitive state. Unlocking the switches' code may one day enable scientists to grow new blood cells for transplant into patients with cancer and other bone marrow disorders.

The scientists located the control switches not at the gene level, but farther down the protein production line in more recently discovered forms of ribonucleic acid, or RNA.

Temperatures are rising on Earth, which is heating up the debate over global warming and the future of our planet, but what may be needed most to combat global warming is a greater focus on adapting to our changing planet, says a team of science policy experts writing in this week's Nature magazine.

While many consider it taboo, adaptation to global climate change needs to be recognized as just as important as "mitigation," or cutting back, of greenhouse gases humans pump into Earth's atmosphere. The science policy experts, writing in the Feb.

In recent years, scientists have discovered that a family of enzymes called sirtuins can dramatically extend life in organisms as diverse as yeast, worms, and flies. They may also be able to control age-associated metabolic disorders, including obesity and type II diabetes.

Naturally occurring substances have been shown to activate sirtuins, including a constituent of red wine called resveratrol -- although an individual would need to drink about two cases of wine a day to derive a clinically effective dose of resveratrol. Still, the findings have energized a number of scientific groups and biotechnology companies, all of which are now eagerly searching for drug candidates able to boost sirtuin activity.

According to a recent paper published by MBARI geologists and their colleagues, methane gas bubbling through seafloor sediments has created hundreds of low hills on the floor of the Arctic Ocean. These enigmatic features, which can grow up to 40 meters (130 feet) tall and several hundred meters across, have puzzled scientists ever since they were first discovered in the 1940s.