
A Calcium Conundrum Explained
Charles Q. Choi is a frequent contributor to Scientific American. His work has also appeared in The New York Times, Science, Nature, Wired, and LiveScience, among others. In his spare time, he has traveled to all seven continents.

A Calcium Conundrum Explained

A Beetle's Menu Change

Does Daylight Saving Time Conserve Energy?
Recent studies shed some light on the efficiency of seasonally changing the clocks

Silkworms: What the Astronauts Eat?

Quantum Entanglement Benefits Exist after Links Are Broken
A way for quantum benefits to survive after entanglement ends

How Teenagers Find Themselves
The development of a key brain area leads to self-consciousness

Ocean Acidification from CO2 Is Happening Faster Than Thought
Carbon dioxide may be acidifying seawater faster than thought

Updates: Whatever Happened to the Risk for Another Indian Ocean Tsunami?
Also: updates on rabies recoveries, bioterror risks and the genetic tracking of religious persecution

Booby Traps for Bacteria

New Kind of Thermometer

Does Dark Matter Encircle Earth?
Dark matter might exert measurable effects on Earth, the moon and gas giants

Sounds like Thunder

Politics of Blank Looks

Seeing on Faith

Do White Blood Cells Make Cancer Deadly?
The ability to spread underlies the killing power of cancer. The process occurs, John Pawelek thinks, when tumor cells fuse with white blood cells—an idea that, if right, could yield new therapies

More Fluid Mileage

Updates: Whatever Happened to Midsize Black Holes?
Also: updates on HIV's origins, Neandertal fishing and transgenic guidelines

News Scan Briefs: Blocking Sound with Holes
Also: electric fields increase fuel economy, sacrificial ants, explosive-free fertilizer and vanishing species

Sacrificial Ants

Hockey Head Trick

Survival of the Luckiest

Blow Away

Reaping a Sad Harvest: A "Narcotic Farm" That Tried to Grow Recovery [Slide Show]
A federal prison in Kentucky was a temporary home for thousands, including Sonny Rollins, Peter Lorre and William S. Burroughs as well as a lab for addiction treatments such as LSD

Updates: Whatever Happened to LED Lightbulbs?
Also Updates on Bubbles Producing Light, Virus-Infecting Viruses and Galapagos Tortoise Breeding