Physics

Humans

Teeth as a forensic clock

Here’s something we’re likely to see that endearing techno whiz kid, Abby Sciuto, whip out of her forensic arsenal next season on NCIS. They’re chemical and nuclear technologies to date teeth. When paired up, new research indicates, they’ll identify not only when people were born but also the age at which they clocked out — thereby pointing to the general date of death.

Physics

Some ‘ball lightning’ reports may be hallucinations

Magnetic fields generated by real bolts could trigger visual effects in the brain.

Earth

BP’s estimate of spill rate is way low, engineer suggests

“It’s not rocket science.” That’s how a Purdue University mechanical engineer described his calculations of startling amounts of oil spewing into the Gulf of Mexico from fissures in heavily damaged piping at a BP drill site. During a May 19 science briefing convened by a House subcommittee, Steve Wereley walked members of Congress through his use of particle image velocimetry to explain how he and other engineers track changes in video images of gases or liquids to estimate the volumes billowing before their eyes.

Physics

Record number of photons lassoed into a quantum limbo 

Physicists entangle five particles, each existing in two states simultaneously.

Chemistry

EPA issues greenhouse-gas rules for new factories and more

EPA released new rules on greenhouse-gas emissions for new power plants, factories and oil refineries — any big new facility, really that emits huge amounts of carbon dioxide, methane, nitrous oxide, or any of several other classes of chemicals. Existing facilities can continue to spew greenhouse gases at current levels.

Physics

Physics on the Edge

Over the past couple of years, researchers have made several new discoveries involving bismuth telluride and other related materials, known as topological insulators.

Earth

BP oil rig’s sinking and gushing crude raise questions

Around 10 p.m. local time on April 20, the Deepwater Horizon — a floating oil-drilling platform leased to British Petroleum — suffered an explosion and fire about 40 miles off the Louisiana coast. While the aftermath of that devastating accident is now being observed and chronicled in painful detail, even the most basic features of what triggered it remain sketchy.

Physics

Making clouds with lasers

Inspired by a classic particle physics experiment, researchers get water droplets to condense by shooting a light beam skyward.

Physics

Reverse engineering a quantum compass

Physicists propose a method that could explain how birds’ magnetic-sensing organs work.

Space

Measuring the weakest of forces

Precise measurements could be used to map tiny fluctuations in the surface properties of materials.

Physics

Army takes gun acoustics beyond ‘bang’

Dissecting the sound of weapon fire may give soldiers an edge.

Materials Science

Infection, kill thyself

Scientists devise wound dressings that trick bacteria into suicide.