"The placenta is this amazing, complex structure and it's unique to mammals, but we've had no idea what its evolutionary origins are," says Julie Baker, PhD, assistant professor of genetics at Stanford Univeristy and senior author of a study in Genome Research which discusses its evolution.

The placenta is the mother's intricate lifeline to her unborn baby, delivering oxygen and nutrients critical to the baby's health. New evidence suggests the placenta of humans and other mammals evolved from the much simpler tissue that attached to the inside of eggshells and enabled the embryos of our distant ancestors, the birds and reptiles, to get oxygen.

The Interuniversity Microelectronics Centre(IMEC), an independent research center focusing on next generations chips and systems and enabling technologies for ambient intelligence, has developed a battery-free, wireless, 2-channel electroencephalography(EEG) system.

The interesting hook is that its hybrid power supply uses body heat and ambient light. It combines a thermoelectric generator that uses the heat dissipated from a person’s temples and silicon photovoltaic cells.

The entire system is wearable and integrated into a device resembling headphones. The system can provide more than 1mW on average indoors, which is more than enough for this application.

There is no question that Al Gore’s 2006 documentary "An Inconvenient Truth" is a powerful example of how scientific knowledge can be communicated to a lay audience.

What continues to be debated is whether it accurately presents the scientific argument that global warming is caused by human activities. Climate change experts express their opinions on the scientific validity of the film’s claims in the newest GeoJournal.

"An Inconvenient Truth" is about Al Gore’s campaign to educate citizens about global warming and inspire them to take action. The papers in GeoJournal agree that it does an excellent job of raising public awareness of man-made global warming and explains why increased atmospheric concentrations of greenhouse gases lead to warming. They also agree that its main weakness is that it tries to use individual extreme events, such as Hurricane Katrina, to prove the existence of global warming.

A new study by researchers at the University of Cambridge says that traders with high morning testosterone levels make more than average profits for the rest of that day. This influence of steroids naturally produced in the body (specifically testosterone and cortisol) may also provide insight into why people caught up in bubbles and crashes often find it difficult to make rational choices, unintentionally exacerbating financial crises.

Testosterone is a steroid hormone which controls competitive encounters as well as sexual behavior. Testosterone in male athletes, for example, will rise prior to a competition and rise even further in a winning athlete (but decrease in a losing one). This increase of testosterone in the winner can increase confidence and risk taking and improve chances of winning yet again, leading to a positive-feedback loop termed the ‘winner effect’. However, too much testosterone can have a detrimental affect on the ability to assess risk rationally.

Researchers at Duke, Caltech, Stanford and the Howard Hughes Medical Institute have developed a living system using genetically altered bacteria that they believe can provide new insights into how the population levels of prey influence the levels of predators, and vice-versa.

The Duke experiment is an example of a synthetic gene circuit, where researchers load new "programming" into bacteria to make them perform new functions. Such re-programmed bacteria could see a wide variety of applications in medicine, environmental cleanup and biocomputing. In this particular Duke study, researchers rewrote the software of the common bacteria Escherichia coli (E. coli.) to form a mutually dependent living circuit of predator and prey.

The bacterial predators don't actually eat the prey, however. The two populations control each others' suicide rates.

You already knew that eastern and western cultures regard many aspects of every day life differently but researchers from Canada, Japan and Amsterdam say that eastern and western cultures even assess situations differently based on the perception of emotions they see.

Across two studies, participants viewed images consisting of one center model and four background models. The researchers manipulated the facial emotion (happy, angry, sad) in the center or the background models and asked the participants to determine the dominant emotion of the center figure.

The majority of Japanese participants (72%) reported that their judgments of the center person’s emotions were influenced by the emotions of the background figures, while most North Americans (also 72%) reported no influence by the background figures at all.