Social psychologists say we send out social cues not just with our facial expressions, but with the tilt of our heads as well.

An otherwise neutral expression looks more dominant when the head is tilted down. The authors speculate that is because tilting one's head downward leads to the artificial appearance of lowered and V-shaped eyebrows--which elicit perceptions of aggression, intimidation, and dominance.

But why does looking like a serial killer seem more dominant than someone with their head tilted back, a pose usually regarded as more confident? Dominant means something different to them than it does the public.

Free fingers have obvious advantages on land, and don't even get us started on opposable thumbs, but provides aquatic or gliding animals with more suitable webbed ones. But both amphibians and amniotes, which include mammals, reptiles, and birds, can have webbed digits. 

A new study has found that during embryo development, some animal species detect the presence of atmospheric oxygen, which triggers removal of interdigital webbing.

A familiar table salt ingredient has been hiding in plain sight on the surface of Jupiter's moon Europa, finds a recent analysis. Using a visible light spectral analysis, planetary scientists have discovered that the yellow color visible on portions of the surface of Europa is actually sodium chloride, a compound known on Earth as table salt, which is also the principal component of sea salt.

The discovery suggests that the salty subsurface ocean of Europa may chemically resemble Earth's oceans more than previously thought, challenging decades of supposition about the composition of those waters and making them potentially a lot more interesting for study.

Cannabis, known as marijuana in the U.S., Cannabis has been cultivated for millennia in East Asia and like many drugs exported from there to become one of the most widely used psychoactive drugs in the world today.

But now archaeologists have tracked down its earliest known use: 2,500-year-old funerary incense burners from the Jirzankal Cemetery in the eastern Pamirs. 

Each year, 1 million men in the U.S. undergo biopsies to determine whether they have prostate cancer because ultrasound imaging cannot clearly display the location of tumors in the prostate gland.

Ultrasound has been used to visualize the prostate in order to take a representative sampling of tissue to biopsy but with MRI doctors can see specific lesions in the prostate and only take tissue samples from those spots.

Why aren't those two sampling methods used in combination?

A multidisciplinary team has found that biopsy guided by magnetic resonance imaging increases the rate of prostate cancer detection.

If you read the Harry Potter series of novels or saw the films, you've known that fiction has people moving in and out of photographs - now that magic has been brought to real life.

The University of Washington algorithm Photo Wake-Up was posted in preprint form on arXiv in December and created a buzz because it can take a person from a 2D photo or a work of art and make them run, walk or jump out of the frame. The system also allows users to view the animation in three dimensions using augmented reality tools. Next week at the Conference on Computer Vision and Pattern Recognition in Long Beach, California, the researchers will be showing results.