Really?: The Claim: Some People Dream Only in Black and White. In an age of high-definition television it might seem peculiar to think that anyone would experience colorless dreams.

Well: For Three Years, Every Bite Organic. Fruits, vegetables and animals can be 100 percent organic. What about people?

Personal Health: Finding, and Treating, Esophageal Cancer. For about 90 percent of patients with esophageal cancer, early detection and treatment are missed, and the outcome is fatal.

Q & A: Time Capsules. How do drugs taken once a week, once a month or even once a year do their work?

Observatory: A New Understanding of Iceberg Formation May Aid Climate Studies. The rate at which icebergs break is primarily a function of the rate at which an ice shelf spreads, a new study suggests.

Endeavour Lands in California, Avoiding Florida Weather. The shuttle landed in the Mojave Desert, diverted from a planned Florida landing by low clouds and high crosswinds.

Vital Signs: Having a Baby: Exercise May Reduce Need for an Epidural. Exercise during pregnancy may help women reduce the need for anesthesia when they give birth, a small study has found.

Vital Signs: Nostroms: Vitamins and Cancer Risk in Women. A large randomized trial of vitamin B and folic acid suggests that they do not lower the risk of cancer for women.

Vital Signs: Regimens: For the Best Pick-Me-Up, Lie Down. A small study suggests that for improved physical and mental performance, an afternoon nap works better than caffeine.

Global Update: Thousands Die Needlessly Because Junta Spends Too Little on AIDS, Group Says. Doctors Without Borders is allowed to work in only some parts of the Myanmar said it is overwhelmed and is having to turn new patients away.

Cardiologists Debate Expensive Heart Scans. A high-tech CT scan is a faster and less invasive procedure, but has no proven benefits over an angiogram, a new study suggests.

The Six Habits of Highly Respectful Physicians. Medical schools may be underemphasizing a simple virtue: good manners.

Report Ties Children’s Use of Media to Their Health. A review of 173 studies found that more time with television, films, video games, magazines, music and the Internet was linked to rises in childhood obesity, tobacco use and sexual behavior.

Observatory: A Ball on the Seafloor Casts Doubt on Views of How Life Diversified. A rolling amoeba of the genus Gromia casts doubt on scientists’ understanding of how life on Earth diversified.

Observatory: Turtle on the Half Shell: Fossils in China Show an Evolutionary Step. A new fossil discovery provides clues as to how turtles came to have shells.

Cases: A Scare Forever Etched. Scary experiences etch the lives of young surgeons and can be great teachers.

Mind: Standing in Someone Else’s Shoes, Almost for Real. Neuroscientists have shown that they can create a “body swapping” illusion that could have a profound effect on a range of therapeutic techniques.

Arrogant, Abusive and Disruptive -- and a Doctor. Recent studies suggest that badly behaved doctors contribute to medical mistakes, preventable complications and even death.

Scientist at Work | Rodolfo Llinás: In a Host of Ailments, Seeing a Brain Out of Rhythm. Rodolfo Llinás believes that abnormal brain rhythms help account for a variety of disorders, but his theory is far from widely accepted.

Carbon Detectives Are Tracking Gases in Colorado. Scientists are tracking where greenhouse gases come from and where they go over time in order to learn how to budget emissions for the long term.

Findings: Health Halo Can Hide the Calories. Have Americans been seduced into overeating by the so-called health halo associated with certain foods and restaurants?

A New Picture of the Early Earth. Geologists now think the planet soon became a cool place of land, seas and perhaps even life.