Stars and galaxies formed back in the early days of the universe,  some 13 billion years ago, were not nearly as massive as originally thought.

Population III stars were not only smaller than believed, they actually formed in binary systems, that is, pairs of stars that orbit a common center, say the results of a new simulation.

"For a long time the common wisdom was that these Population III stars formed alone," said Brian O'Shea, a Michigan State University assistant professor of physics and astronomy  who did the research with two colleagues. "Researchers also have believed that these stars were incredibly massive – up to 300 times the size of our own sun. Unfortunately, the observations just didn't jibe with the simulations we created."

The National Children's Study is an ideal opportunity to get valuable information about pregnant women's health, the most underrepresented population in clinical research, say ethicists at Duke University Medical Center, Johns Hopkins and Georgetown Universities. 

The new national study aims to follow children from conception to adulthood.

Although the Institute of Medicine began recommending that pregnant women be included in clinical trials 15 years ago, pregnant women remain excluded from trials for many reasons, primarily ethical concerns raised in the balance between mothers, a consenting group, and babies who have no choice.

In an article that makes us want to review the "Studies you won't need to read" section,  UC  San Diego School of Medicine researchers examined HIV infection among male clients of female prostitutes - in Tijuana, of all places - and decided and found that over half of male clients had recently had other risky sexual behavior, like unprotected sex.

Unprotected sex with a tijuana prostitute  is what poker players would call a 'tell' when it comes to risky behavior.   They also reported a high prevalence of drug use. 

The public looks up to scientists but scientists tend to look down on the public; and science journalism gets a lot of the blame.  So say the findings of a new report by the Pew Research Center for the People&the Press which finds that overwhelming majorities of Americans believe that science has had a positive effect on society and that science has made life easier for most people. The public - even those skeptical of climate change and evolution - rates scientists highly and believes government investments in science pay off in the long term. 

A team of astrophysicists say they have solved a mystery that led some scientists to speculate that the distribution of certain gamma rays in our Milky Way galaxy was evidence for undetectable 'dark matter' making up much of the mass of the universe.

In two papers, the astrophysicists instead say that this distribution of gamma rays can be explained by the way "antimatter positrons" from the radioactive decay of elements, created by massive star explosions in the galaxy, propagate through the galaxy. Thus, they say, the observed distribution of gamma rays is not evidence for dark matter.

The NY Times recently criticized cancer funding policies as being too risk-averse.

The Director of the National Cancer Institute has responded, but his response helps prove the point that funding is too risk averse: