The best of the rest from the Physics arXiv:

Buffering Blood Pressure Fluctuations By Respiratory Sinus Arrhythmia May In Fact Enhance Them: A Theoretical Analysis

The company will start production of a high-performance car that reaches 198 mph and can get 78 mpg.

The startup LS9 reveals a discovery that could lead to biofuels that would work in conventional engines.

Many species naturally make small amounts of hydrocarbons. Now researchers at the startup LS9, based in South San Francisco, CA, have described the genes and enzymes responsible for this production of alkanes, the major components of fuels such as diesel. The findings, reported in the current issue of the journal Science, have allowed the researchers to engineer E. coli bacteria that can secrete alkane hydrocarbons capable of being burned in diesel engines.

Mirror neurons light up when we're put in their shoes.

Software that gives users more control of a camera could revolutionize photography.

Camera-phone owners can use new software to reprogram these devices--and capture images that would previously have been impossible to get.

Geron will begin tests of its therapy for spinal cord injury. Advanced Cell Technology hopes to follow with a stem cell treatment for blindness.

The Food and Drug Administration has cleared Geron, a stem cell company based in Menlo Park, CA, to move forward with clinical tests of its experimental cell therapy for spinal cord injury, which is derived from embryonic stem cells. The company, which has been working on cell based therapies for the last decade, first won permission to begin clinical testing in January of 2009. But the trials were put on hold last August due to new safety concerns from animal tests. The clinical trial marks the first human tests of a therapy derived from embryonic stem cells.

Search results may increasingly be poisoned with links to malicious sites, a researcher says.

Searching for a hot news topic or buzzword can already lead an unsuspecting person to harmful malware. Recent articles are full of warnings about malware hidden in links that are supposedly about the World Cup or the Icelandic Volcano. Estimates have suggested that about 14 percent of traditional searches for trending news go to sites hosting malware.

Creating single photons is becoming straightforward. Now engineers have worked out how to steer the photons they produce with the flick of a switch.

Photon guns are important tools for engineers attempting to build the next generation of quantum communications gear.

A chemical-infused scaffold generates new tissue by attracting stem cells.

Today's titanium replacement joints work very well for 10 to 15 years, but replacing them after they've worn out is a challenge for both patient and surgeon. A team of researchers from Columbia University proposes a way around that problem: by implanting a scaffold that encourages the patient's own stem cells to regrow the joint.

A computer security researcher demonstrates attacks on cash machines.

Yesterday, during a flashy presentation at the Black Hat security conference in Las Vegas, a computer security expert showed several ways to break into ATMs.

A report from Bloomberg New Energy Finance details international government energy spending on biofuels and renewable energy.

Fossil fuels are the backbone of economies worldwide, so governments spend a lot to support them. A new report from Bloomberg New Energy Finance says altogether governments spent between $43 anf $46 billion on renewable energy and biofuels last year, not including indirect support, such as subsidies to corn farmers that help ethanol production. Direct subsidies of fossil fuels came to $557 billion, the report says.

Implantable devices work in diabetic pigs for over a year--human tests could be next.

Researchers have successfully tested a fully implantable glucose-monitoring device in pigs for nearly two years, according to new research published today in Science Translational Medicine. Scientists plan to file for approval from the U.S. Food and Drug Administration to begin human tests. Eventually, researchers aim to couple this kind of device with one that would automatically deliver insulin in response to changing blood-sugar levels.