Sediment cores retrieved from the Arctic’s deep-sea floor by the Integrated Ocean Drilling Program’s Arctic Coring Expedition (ACEX) report that the Arctic Ocean changed from a landlocked body of water (a ‘lake stage’) through a poorly oxygenated ‘estuarine sea’ phase to a fully oxygenated ocean at 17.5 million years ago during the latter part of the early Miocene era.

The authors attribute the change in Arctic conditions to the evolution of the Fram Strait into a wider, deeper passageway that allowed an inflow of saline North Atlantic water into the Arctic Ocean.

Scientists have long thought that microtubules, part of the microscopic scaffolding that the cell uses to move things around in order to hold its shape and divide, originated from a tiny structure near the nucleus, called the centrosome.

Now, researchers at Vanderbilt University Medical Center reveal a surprising new origin for these cellular "highways." Irina Kaverina, Ph.D., and colleagues report that the Golgi apparatus -- a stack of pancake-shaped compartments that sorts and ships proteins out to their cellular destinations -- is the source of a particular subset of these microscopic fibers. The findings point to a novel cellular mechanism that may guide cell movement and possibly cancer cell invasion.

Women cheat on men for their own needs but superb starling females stray from their mates for the sake of their chicks, according to recent Cornell research. This reasoning includes being able to know if mates are too 'genetically similar' for breeding.

That gives 'doing it for the kids' a whole new layer of meaning. The study found that superb starling females (Lamprotornis superbus) cheat on their mates based on these factors:

• Superb starlings are cooperative breeders, meaning breeding pairs get help in raising chicks from other family group members. Some females mate with subordinate males when they need help to raise their chicks.

Researchers say they have discovered the gene that regulates stem cell ability to self-renew and to differentiate into highly specialized types. This means they could program stem cells to become certain cells or do repair automatically.

“You could call this a ‘theory-of-everything’ for stem cells,” said senior author Dr. Michael Rudnicki, Senior Scientist and Professor at the Ottawa Health Research Institute and the University of Ottawa, referring to the often-cited theory of everything for physics.

For more than 25 years, stem cells have been defined based on what they can become: more of themselves, as well as multiple different specialized cell types.

It's fun to imagine life on other planets being advanced alien civilizations and exotic creatures conversing in foreign languages but it's not possible to determine any of those things now.

Instead, by studying various biosignatures found in the light spectrum leaking out to Earth, researchers can speculate on what kind of photosynthesis might occur on such planets and what the extrasolar plants might look like.

Paint it black

It could be the plants are black, says Robert Blankenship, Ph.D., Lucille P. Markey Distinguished Professor in Arts & Sciences at Washington University in St. Louis. But it all depends on what size and light intensity of star – or sun – the planet feeds off, and the extrasolar planet’s atmospheric chemistry.

The obesity epidemic has become a major public health problem in both industrialized countries and the developing world. Recent studies suggest that the major development of persistent adiposity is established already at pre-adolescence.

The fact that obesity is mainly determined before puberty implies that preschool detection of children at risk is essential along with individual prevention programs.

A Swedish study reports a protocol that detects with high precision which pre-adolescent children will be obese later using only weight and height data.