Exposure to air pollution significantly reduces foetus size during pregnancy, according to a new study by Brisbane scientists.

Queensland University of Technology senior research fellow Dr Adrian Barnett said the study compared the foetus sizes of more than 15,000 ultrasound scans in Brisbane to air pollution levels within a 14km radius of the city.

"The study found that mothers with a higher exposure to air pollution had foetuses that were, on average, smaller in terms of abdominal circumference, head circumference and femur length," Dr Barnett said.

A ninety minute daytime nap helps speed up the process of long term memory consolidation, a recent study conducted by Prof. Avi Karni and Dr. Maria Korman of the Center for Brain and Behavior Research at the University of Haifa found.

"We still don't know the exact mechanism of the memory process that occurs during sleep, but the results of this research suggest the possibility that it is possible to speed up memory consolidation, and in the future, we may be able to do it artificially," said Prof. Karni.

Long term memory is defined as a permanent memory that doesn't disappear or that disappears after many years.

A mysterious and unpredictable group of side effects from modern medications called idiosyncratic drug reactions (IDRs) likely will persist as a major health care problem unless there is a dramatic increase in research funding, according to a 20-year review of research in the field scheduled.

The review, by Jack Uetrecht at the University of Toronto, defines IDRs as reactions that happen unexpectedly and with no obvious connection to the known effects of a medication’s ingredients or dosage. Although relatively rare, IDRs make an important contribution to the annual burden of death, illness, and increased health care costs from serious adverse drug reactions.

A new study from Danish researchers has found that childless men have a lower risk of developing prostate cancer than fathers, and that, paradoxically, the more children a father has, the lower the risk of the disease. The study appears in the February 15, 2008 issue of CANCER.

Whether fatherhood can affect the risk of prostate cancer remains controversial. Evidence has suggested that childless men may be at lower risk of prostate cancer than men with children, and that men who father sons may be at lower risk than men with daughters only.

Oxytocin, a hormone involved in child-birth and breast-feeding, helps people recognize familiar faces, according to new research in the January 7 issue of The Journal of Neuroscience. Study participants who had one dose of an oxytocin nasal spray showed improved recognition memory for faces, but not for inanimate objects.

Eight-year-old boys dream of being superheroes - flying high above the clouds with nothing to limit themselves but their imaginations - and Danner Cronise got his dream, courtesy of his dad, Ray, co-founder of Zero Gravity Corporation. In the process he set the record as the youngest person to experience zero-gravity flight.

Danner was joined by his father Ray, and older sisters Erin (10) and Alex (12). A NASA engineer for more than 15 years, Ray Cronise had a unique and personal reason for wanting to see his children enjoy weightlessness first hand. "It is awe inspiring to be able to take your kids on such a memorable experience. Being exposed to these kinds of adventures kindles curiosity and keeps them dreaming," said Ray.