China and India to Join Copenhagen Climate Change Accord:
The countries are the last two major economic powers to agree with the aims of the nonbinding agreement.
John Thorbjarnarson, 52, a Leading Expert on Crocodiles:
Mr. Thorbjarnarson was a scientist with wide interests in saving and learning about many species.
Obama Plans Florida Forum to Discuss NASA’s Future:
The president planned to spell out his vision for the future of American astronauts in space at a conference next month.
Reaching for Stars When Space Thrilled and Paranoia Ruled:
In a new book about the space race, Megan Prelinger sees hopes, dreams and fears in the form of magazine ads.
The Diminishing Difficulty of Enriching Uranium:
Making the leap from reactor-grade nuclear fuel to bomb-grade is like the rich getting richer: really fast.
A Conversation With Dr. Peter J. Pronovost: Doctor Leads Quest for Safer Ways to Care for Patients:
Dr. Peter J. Pronovost, medical director of the Quality and Safety Research Group at Johns Hopkins Hospital in Baltimore, travels the country advising hospitals on innovative safety measures.
Scientists See Fresh Signs of More Water on the Moon:
“Relatively pure” ice is believed to be in small craters near the lunar north pole, and researchers say it could be easily tapped by future explorers.
Rapid DNA Sequencing Can Help Doctors Track Cancer Treatment:
If altered bits of genetic material could be picked up in a patient’s bloodstream, they would serve as a direct and sensitive marker of cancer.
Flu Shots in Children Can Help Community:
A study of farming colonies in Canada found that giving flu vaccine to schoolchildren protected the community.
After Cancer, Removing a Healthy Breast:
A procedure gains popularity but doesn't improve survival odds.
Obama Turns Up the Volume in Health Care Bid:
In an appearance that harked back to his 2008 campaign, President Obama made an emotional pitch for public support.
Protein Suspected in Alzheimer’s May Be Needed to Fight Infection:
Beta amyloid, which was once thought to be a chief villain in Alzheimer’s, may be part of the brain’s normal defenses, researchers at Harvard suggested.
For the Afflicted, a Little Black Box to Jog Failing Memory:
Researchers have tested the Sensecam, which contains a digital camera and an accelerometer, as an aid to people with Alzheimer’s disease and other memory disorders.
Global Update: The Fight Against AIDS, Malaria and Tuberculosis Goes Online:
Using their computers, travelers will be able to donate $2 when making reservations on some Internet travel sites.
First Mention: Defibrillators, 1948:
In 1899, two Swiss researchers discovered that an irregular heartbeat could be stopped by shocking the heart.
Vital Signs: New Study Finds Many Americans Say They’re Too Tired for Sex:
A National Sleep Foundation report on ethnic groups’ habits found responses on tiredness and sex were similar for most groups.
Vital Signs: One in Four Parents Link Autism to Vaccines, Study Finds:
Most reported vaccinating their children, but more than half said they were concerned about adverse effects.
Vital Signs: Cognitive Decline Is More Likely After Hospitalization:
A new study found that older people hospitalized for a critical condition had a statistically significant drop in scores on cognitive tests when compared with people who had not been hospitalized.
Dr. Barton Childs, Who Studied Inherited Diseases, Is Dead at 93:
Dr. Childs helped shape the understanding of inherited diseases as scientists learned more about so-called inborn errors of metabolism, biochemistry and molecular biology.
Q & A: Almonds for Calcium?:
Are almonds a good source of calcium or do they block calcium absorption?
Observatory: A Vitamin Boost for Greens Under the Supermarket’s Glow:
Researchers found that spinach leaves exposed to light had higher levels of vitamins than those kept in darkness.
Observatory: Scientists Propose a More Efficient Way to Make Ethanol:
Researchers said they found a way to break down lignocellulose, the basic structural material of all plants, to make fuel from crop waste.
Observatory: One Reason Lizards Have Ears? To Eavesdrop, Perhaps:
While most lizards do not communicate among themselves, some use their ears to listen for warning calls from other animals, researchers say, which could alert them to predators.
18 and Under: When a Child’s Nosebleed or Bruising Is a Blood Disorder:
Some of the ailments, like idiopathic thrombocytopenic purpura, are usually resolved on their own, but others require treatment.
Cases: Fake Nostalgia for a Pre-Therapy Past:
Navigating difficult years with the help of someone who gets it.
Personal Health: To Keep Moving, Look Beyond the Physical:
For many people, regular physical activity is as much about social interaction as it is about being healthy.
Really?: The Claim: A Glass of Wine With Dinner Aids Digestion:
Can wine help you digest your meal?
Letters: Measuring Moving Pictures (1 Letter):
A letter to the editor.
Letters: The Riddle of Weight Loss (1 Letter):
A letter to the editor.
Letters: Covering Little Ears (1 Letter):
A letter to the editor.
Letters: An Advocate for Exercise (1 Letter):
A letter to the editor.
Letters: Joy, Pain and Aging (1 Letter):
A letter to the editor.