Early in the formation of the Earth, some forms of the element chromium separated and disappeared deep into the planet's core, according to a new study in Science.

The team studied a class of meteorites called chondrites, which are leftovers from the formation of the solar system more than 4.5 billion years ago.    By making very accurate measurements of chromium isotopes in the meteorites compared to Earth rocks and comparing them to theoretical predictions, the researchers were able to show for the first time that lighter isotopes of chromium preferentially go into the core.   From this the team inferred that some 65 percent of the missing chromium is most likely in the Earth's core.

Up to 12 percent of Americans may get Alzheimer's disease, current statistics say.  In the quest to prevent Alzheimer's, or at least make it manageable like diabetes, a group of researchers are working on a nasally-delivered vaccine that promises to protect against Alzheimer's.  Bonus: It may help prevent strokes also.

The new vaccine repairs vascular damage in the brain by using the body's own immune system and, in addition to its prophylactic effect, it can work even when Alzheimer's symptoms are already present, according to the paper in Neurobiology of Aging.

SKIPTON, England, March 1, 2011 - Grotty old beds could be behind a growing epidemic of 'toxic sleep'. 

 A new Sleep Council survey just in time for National Bed Month shows nearly half of us are getting just six hours sleep or less a night. And an alarming four out of five people complain of disturbed or inadequate - 'toxic' - sleep. 

The survey was conducted online by Pollab Ltd between January 26 - 27 2011. 1,030 UK adults (aged 16+) were questioned, the sample being broadly representative of the UK population and demographically broken down by age, gender, region and marital status.

Among environmental activists and their supporters, the use of genetic modification is a bad thing.   Obviously, tomatoes would be the size of our thumbs if our ancestors did not genetically modify plants so research continues.   A group of researchers has announced that plants have for the first time been cloned as seeds, a major step toward making hybrid crop plants that can retain favorable traits from generation to generation - something to which even the most anti-science people can object.

A preliminary study in JAMA (JAMA. 2011;305[8]808-814.) has found that 50-minute cell phone use was associated with increased brain glucose metabolism, a marker of brain activity, in the region closest to the phone antenna, but that is not known to have any clinical significance.

Modern cosmology believes that for the universe to behave as it does, the mass-energy of the universe must be dominated by dark matter and dark energy, though there is no direct evidence for the existence of these invisible components.    Alternate, though unpopular, possibilities are that the current theory of gravity does not suffice to describe the dynamics of cosmic systems.