ScienceDaily: Top Science News

---

• How petals get their shape: Hidden map located within plant's growing buds
• Cheating favors extinction, yeast study finds: Feedback between population and evolutionary dynamics
• Colossal hot cloud envelopes colliding galaxies
• New research helps to show how turbulence can occur without inertia
• Saturn's youthful appearance explained
• Musical memory deficits start in auditory cortex
• First land animals kept fishlike jaws for millions of years
• Does antimatter fall up or down? First direct evidence of how atoms of antimatter interact with gravity
• What triggers those late-night snack cravings?
• Deep, detailed image of distant universe
• Shedding light on the long shadow of childhood adversity
• NASA probe gets close-up views of large hurricane on Saturn
• Researchers successfully treat autism in infants: Playing games that infants prefer can lessen severity of symptoms

How petals get their shape: Hidden map located within plant's growing buds Posted: 30 Apr 2013 04:43 PM PDT Why do rose petals have rounded ends while their leaves are more pointed? Scientists have revealed that the shape of petals is controlled by a hidden map located within the plant's growing buds.

Cheating favors extinction, yeast study finds: Feedback between population and evolutionary dynamics Posted: 30 Apr 2013 04:42 PM PDT Cooperative behavior is widely observed in nature, but there remains the possibility that 'cheaters' can exploit the system, with uncertain consequences for the social unit as a whole. A new study has found that a yeast colony dominated by non-producers ('cheaters') is more likely to face extinction than one consisting entirely of producers ('co-operators'). The findings are the results of the first laboratory demonstration of a full evolutionary-ecological feedback loop in a social microbial population.

Colossal hot cloud envelopes colliding galaxies Posted: 30 Apr 2013 12:15 PM PDT Scientists have completed a detailed study of an enormous cloud of hot gas enveloping two large, colliding galaxies. This unusually large reservoir of gas contains as much mass as 10 billion Suns, spans about 300,000 light years, and radiates at a temperature of more than 7 million degrees.

New research helps to show how turbulence can occur without inertia Posted: 30 Apr 2013 11:21 AM PDT For more than a century, the field of fluid mechanics has posited that turbulence scales with inertia, and so massive things, like planes, have an easier time causing it. Now, new research has shown that this transition to turbulence can occur without inertia at all.

Saturn's youthful appearance explained Posted: 30 Apr 2013 10:15 AM PDT As planets age they become darker and cooler. Saturn, however, is much brighter than expected for a planet of its age -- a question that has puzzled scientists since the late 1960s. New research has revealed how Saturn keeps itself looking young and hot.

Musical memory deficits start in auditory cortex Posted: 30 Apr 2013 10:13 AM PDT Congenital amusia is a disorder characterized by impaired musical skills, which can extend to an inability to recognize very familiar tunes. The neural bases of this deficit are now being deciphered. According to a new study amusics exhibit altered processing of musical information in two regions of the brain: the auditory cortex and the frontal cortex, particularly in the right cerebral hemisphere. These alterations seem to be linked to anatomical anomalies in these same cortices.

First land animals kept fishlike jaws for millions of years Posted: 30 Apr 2013 10:11 AM PDT For the first time, fossil jaw measurements confirm that land animals developed legs millions of years before their feeding systems changed enough to let them eat a land-based diet. The pattern had been hypothesized previously, but not really tested.

Does antimatter fall up or down? First direct evidence of how atoms of antimatter interact with gravity Posted: 30 Apr 2013 08:34 AM PDT The atoms that make up ordinary matter fall down, so do antimatter atoms fall up? Do they experience gravity the same way as ordinary atoms, or is there such a thing as antigravity? Recent results, which measured the ratio of antihydrogen's unknown gravitational mass to its known inertial mass, did not settle the matter. Far from it. If an antihydrogen atom falls downward, its gravitational mass is no more than 110 times greater than its inertial mass. If it falls upward, its gravitational mass is at most 65 times greater. What the results do show is that measuring antimatter gravity is possible, using an experimental method that points toward much greater precision in future.

What triggers those late-night snack cravings? Posted: 30 Apr 2013 08:03 AM PDT The circadian system increases hunger and cravings for sweet, starchy and salty foods in the evenings, according to new research. Eating higher-calorie foods in the evening can be counterproductive if weight loss is a goal since the human body handles nutrients differently depending on the time of day.

Deep, detailed image of distant universe Posted: 30 Apr 2013 07:59 AM PDT Staring at a small patch of sky for more than 50 hours with the ultra-sensitive Karl G. Jansky Very Large Array (VLA), astronomers have for the first time identified discrete sources that account for nearly all the radio waves coming from distant galaxies. They found that about 63 percent of the background radio emission comes from galaxies with gorging black holes at their cores and the remaining 37 percent comes from galaxies that are rapidly forming stars.

Shedding light on the long shadow of childhood adversity Posted: 30 Apr 2013 07:57 AM PDT Childhood adversity can lead to chronic physical and mental disability in adult life and have an effect on the next generation, underscoring the importance of research, practice and policy in addressing this issue, according to a new article.

NASA probe gets close-up views of large hurricane on Saturn Posted: 30 Apr 2013 07:14 AM PDT NASA's Cassini spacecraft has provided scientists the first close-up, visible-light views of a behemoth hurricane swirling around Saturn's north pole. In high-resolution pictures and video, scientists see the hurricane's eye is about 1,250 miles (2,000 kilometers) wide, 20 times larger than the average hurricane eye on Earth. Thin, bright clouds at the outer edge of the hurricane are traveling 330 mph(150 meters per second). The hurricane swirls inside a large, mysterious, six-sided weather pattern known as the hexagon.

Researchers successfully treat autism in infants: Playing games that infants prefer can lessen severity of symptoms Posted: 30 Apr 2013 06:25 AM PDT Most infants respond to a game of peek-a-boo with smiles at the very least, and, for those who find the activity particularly entertaining, gales of laughter. For infants with autism spectrum disorders, however, the game can be distressing rather than pleasant, and they'll do their best to tune out all aspects of it -- and that includes the people playing with them.

You are subscribed to email updates from ScienceDaily: Top Science News To stop receiving these emails, you may unsubscribe now.	Email delivery powered by Google
Google Inc., 20 West Kinzie, Chicago IL USA 60610