ALLERGY, RESPIRATORY
Air Pollution May Raise Blood Pressure
Molecule in Skin May Link Eczema and Asthma
New Spray Could Benefit Cystic Fibrosis Patients
ALTERNATIVE MEDICINE
Tai Chi: An Ideal Exercise for Many People with Diabetes
Naprapathy: A Hands-On Approach to Pain Management
Spot light on Dani Antman New Lionheart teacher
ANIMAL CARE
Safe Toys for Dogs
Rest Easy. When It Comes to Swine Flu, Your Pet Is Safe
'Comfort Dogs' Come to Emotional Rescue
BONES & JOINTS
Most Women With Osteoporosis Unaware of Raised Fracture Risk
Get in Step With Summer Foot Care
Soccer's a Winner for Building Bone Health in Girls
CANCER
Get to Know the Pap Test
Gene Studies Reveal Cancer's Secrets
Study Cites Gains in Gall Bladder Cancer Treatment
CAREGIVING
Baby's Sleep Position May Not Affect Severity of Head Flattening
Birthmark or Blood Vessel Problem?
Diabetes Epidemic Now Poses Challenges for Nursing Homes
CIRCULATORY SYSTEM
Bad Marriages Harder on Women's Health
Night Shift Work Hard on the Heart
Drink a Little Wine, Live a Little Longer
COSMETIC
What to Do If You Have Unsightly Veins
Contact Lenses Boost Kids' Self-Image
Gum Chewing May Cut Craving for Snacks
DENTAL, ORAL
Good Oral Hygiene May Protect Against Heart Infections
Gum Disease Might Boost Cancer Risk
Gum Care Helps Control Type 2 Diabetes and Its Complications
DIABETES
Vitamin K Slows Insulin Resistance in Older Men
Americans Consuming More Sugary Beverages
Lifestyle Factors Tied to Older Adults' Diabetes Risk
DIET, NUTRITION
More Calcium And Dairy Products in Childhood Could Mean Longer Life
Uncover Why Turmeric Helps You Heal
Compound in Red Wine Fights Ravages of Age
DISABILITIES
Review Finds Marijuana May Help MS Patients
Could Your Cell Phone Help Shield You From Alzheimer's?
ENVIRONMENTAL HEALTH
Ozone-Depleting Inhalers Being Phased Out
FDA Faulted for Stance on Chemical in Plastics
Traffic Seems to Make Kids' Asthma Worse
EYE CARE, VISION
Eye Problems, Hearing Loss May Be Linked
Eye Disease, Cognitive Decline Linked in Study
Thyroid Problems Boost Glaucoma Risk
FITNESS
After a Stroke, Light Exercise Gets Hands, Arms Working Again
Want to Stop Cancer? You Can, Experts Say
Mom and Baby Alike May Benefit From Exercise
GASTROINTESTINAL PROBLEMS
Peppermint Oil, Fiber Can Fight Irritable Bowel
Japanese Herbals May Ease Gastro Woes
Intestinal Bacteria Trigger Immune Response
GENERAL HEALTH
Want to Stop Cancer? You Can, Experts Say
Biomarkers May Help Measure Rate of Decline in Dementia
Pesticides and How to Affordably Eat Organic or Reduce Pesticide Consumption
HEAD & NECK
Ski Helmets Encouraged for All
Many Children Will Outgrow Headaches
Zen May Thicken Brain, Thwart Pain
HEALTH & TECHNOLOGY
'Cell Phone Elbow' -- A New Ill for the Wired Age
'Comfort Dogs' Come to Emotional Rescue
Magnet Therapy May Ease Hard-to-Treat Depression
HEARING
Noise Hurts Men's Hearing More, Study Shows
Summer Sounds Can Lead to Hearing Loss
HEART & CARDIOVASCULAR
Whole Grains Lower Risk of Heart Failure
Irregular Heartbeat Tied to Alzheimer's Disease
Boosting Vitamin D Can Do a Heart Good
INFECTIOUS DISEASE
Poor Restroom Cleaning Causes Cruise-Ship Sickness
Swine Flu Closes Three Schools in NYC
Swine Flu Is Now a Pandemic Says W.H.O.
INFERTILITY
Obesity May Affect Fertility in Young Womene
KID'S HEALTH
Exercise Helps Reduce Falls in Young and Old
Even Young Kids Can Learn CPR
Winter's Bitter Cold Poses Health Dangers
MEN'S HEALTH
Varicose Veins May Mask Larger Problem
Lots of Sex May Prevent Erectile Dysfunction
Low Vitamin D Levels May Boost Men's Heart Attack Risk
MENTAL HEALTH
Keeping Mentally Active Seems To Keep The Brain Active
A Simple 'Thank You' Brings Rewards to All
Daily dose of beet juice promotes brain health in older adults
PAIN
Acupuncture, Real or Fake, Eases Back Pain
Alleviating Rheumatoid Arthritis
'Cell Phone Elbow' -- A New Ill for the Wired Age
PHYSICAL THERAPY
PREGNANCY
Expectant Mom's Exercise Keeps Newborn's Birth Weight Down
Sleeping Could Help Women Lose The Baby Fat
Exercise Boosts Bone Density in Breast-Feeding Moms
SENIORS
Martial Arts Training May Save Seniors' Hips
More Whole Grains May Mean Less Fat
For a Healthier Retirement, Work a Little
SEXUAL HEALTH
SLEEP DISORDERS
Sleeping Could Help Women Lose The Baby Fat
Exercising Throat Muscles May Relieve Sleep Apnea
Moderate Aerobics May Ease Insomnia Symptoms
WOMEN'S HEALTH
Soy May Not Lead to Denser Breasts
Acupuncture May Relieve Acid Indigestation In Pregnancy
Sleeping Could Help Women Lose The Baby Fat
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Meat-Eating Dinosaurs Used Legs and Arms Like Birds

WEDNESDAY, March 4 (HealthDay News) -- Meat-eating dinosaurs that walked on their hind legs (theropods) and held their arms with their palms faced inward -- just like birds -- were roaming the Earth at least 198 million years ago.

It's long been known that theropods, such as Tyrannosaurus rex and Velociraptor, held their arms this way. But a lack of clear fossil evidence has made it difficult to determine when this bird-like posture evolved.

A report published online this week in the journal PLoS One details fossilized handprints and footprints made by a large, meat-eating dinosaur about 198 million years ago. The tracks in rocks in St. George, Utah, were made by a theropod that sat down and extended its arms far enough that they left marks in the ground.

"The crouching tracks are preserved on the shore of an ancient lake," the paper's lead author, Andrew Milner, a paleontologist at the St. George Dinosaur Discovery Site at Johnson Farm museum, said in a journal news release. "The theropod that made the tracks may have been in the lake but walked out and up a shallow slope and sat down for some reason."

"These tracks are important because the handprints have inward-pointing fingers, showing that even very early theropods had bird-like arms and hands with inward-facing palms," Milner said.

Co-author Jerry Harris, of Dixie State College in St. George, said in the news release that "while theropod arms couldn't pivot to make the palms face up or down the way a human's hands can, they certainly could move."

"In particular, the wrist could pivot up and down, allowing the outside of the hand to move toward the side of the arm, a motion impossible for humans," Harris said. "But this is the same motion birds have that allows them to fold their wings."

"These tracks show that this ability evolved long before feathery wings did, and much earlier than this posture is known from theropod skeletons," he said. "Birds only inherited this ability from their ancestors."

The theropod tracks were found in a large area that also included the fossilized tracks of more than 1,000 large and small dinosaurs and small, early relatives of alligators and crocodiles.

More information

The University of California Museum of Paleontology has more about theropods.



-- Robert Preidt



SOURCE: PLoS One, news release, March 3, 2009

Last Updated: March 04, 2009

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