There's a mystery in them there clouds - but astronomers at Caltech are on the case.

Near the crowded galactic center, billowing clouds of gas and dust hide a supermassive black hole 3,000,000X as massive as our sun, Its gravity is strong enough to grip stars that are whipping around it at thousands of kilometers per second. One particular cloud named G0.253+0.016
has delighted astronomers. Because scientists love a mystery. 

G0.253+0.016 defies the rules of star formation. But apparently those are more guidelines than rules.

Students everywhere, put down those highlighters and pick up some flashcards! Some of the most popular study strategies, like highlighting and even re-reading, don't show much promise for improving student learning, according to a new paper.

In the article, psychologist John Dunlosky of Kent State University and colleagues review ten learning techniques commonly used by students.

Based on the available evidence, they provide recommendations about the applicability and usefulness of each technique.

People view brown-eyed faces as more trustworthy than those with blue eyes- unless the blue eyes belong to a man with a broad face, according to a new paper in PLOS ONE. 

Vega is the second brightest star in northern night skies and astronomers using the Infrared Space Telescopes have discovered an asteroid belt much like that of our sun. 

Results showing an asteroid belt around Vega makes it more similar to its twin, the star called Fomalhaut. Both stars now are known to have inner, warm asteroid belts and outer, comet-filled belts, similar in architecture to the asteroid and Kuiper belts in our own solar system.

Writing in JAMA, a group of researchers say the way to curb gun violence is to treat guns as a public health awareness issue, the way we do awareness campaigns against cigarettes and drunk driving.

So media, celebrities and the public should "de-glorify" guns the same way, though the efficacy of the campaigns they list is suspect.  In movies, directors now make sure the edgy, rebellious person smokes, in order to show how edgy and rebellious they are. And marijuana use is actually being encouraged in lots of the same states that ban cigarettes in bars despite billions of dollars in awareness campaigns about the dangers of drugs.

A popular hypothetical alternative to Albert Einstein's theory for the acceleration of the expansion of the universe does not fit newly obtained data on a fundamental constant, the proton to electron mass ratio, which may mean the need for a new direction in learning about accelerating expansion.

To explain the acceleration of the expansion of the universe, astrophysicists have invoked dark energy – a hypothetical form of energy that permeates all of space. A popular concept of dark energy does not fit new results on the value of the proton mass divided by the electron mass in the early universe. The predicted change in the ratio by the dark energy theory, generally referred to as rolling scalar fields, don't fit the new data.

The Tree of Life is what Charles Darwin first sketched in 1837 to show how species evolved by natural selection. The diagram started at a central point with a common ancestor, then the lines spread apart as organisms evolved and separated into distinct species. The letters represented species.

During an earthquake, waves emitted when the two sides of a fault move—or slip—rapidly past each other, create ground motion, with an average relative speed of about three feet per second.

Not all fault segments move so quickly. Some slip slowly, through a process called creep, and are considered to be "stable," or not capable of hosting rapid earthquake-producing slip. 

One common hypothesis suggests that such creeping fault behavior is persistent over time, with currently stable segments acting as barriers to fast-slipping, shake-producing earthquake ruptures. 

Researchers at Imperial College have released a video game that was written in part by what they call an Artificial Intelligence (AI) "machine" named Angelina, which is a clever acronym for "A Novel Game-Evolving Labrat I've Named Angelina".

Their latest effort, released last month, is called "A Puzzling Present" (download it here). Players have to help Santa collect gifts on 30 Christmas levels with holly and other things getting in the way.

Not all isolated stem cells are equally valid in regenerative medicine and tissue engineering - only a specific group of cord blood stem cells (CB-SC) maintained in culture are useful for therapeutic purposes, say researchers in a new paper.

At present,  cord blood stem cells
 - adult stem cells - are key to regenerative medicine and tissue engineering. From all types of
cord blood stem cells
those called "Wharton's jelly stem cells" (HWJSC) have piqued the interest of specialists in regenerative medicine at the University of Granada and Alcalá de Henares University, because of their accessibility and ability to develop into several types of tissue and modulate immune responses.