An actor prepares to receive "shocks" from the audience on a fake TV game show, staged for a French documentary. Psychologists have questioned the ethics of such experiments because of possible mental trauma suffered by participants. Christophe Russeil, HO/AP hide caption

itoggle caption Christophe Russeil, HO/AP

DNA analysis showed that most dogs share genetic markers with Middle Eastern gray wolves, like this one photographed in Israel. Courtesy of Nadav Perez hide caption

itoggle caption Courtesy of Nadav Perez

Researchers were able to correctly match bacterial DNA on keyboards and computer mice with their individual users. This bacterial "fingerprint" could become a new forensic tool, though it's not yet ready for the courtroom. istockphoto.com hide caption

itoggle caption istockphoto.com

A genetic abnormality causes this chicken to exhibit both male and female characteristics. The right (white) side is typical of males and the left (brown) side is typical of females. The Roslin Institute at the University of Edinburgh hide caption

itoggle caption The Roslin Institute at the University of Edinburgh

Chameleons, such as this Chamaeleo calyptratus, feed by way of ballistic tongue projection, which launches their tongues at prey with a rapid burst of speed. Cold temperatures do not slow their tongues down, allowing chameleons to catch meals even when the temperature drops. Courtesy of Christopher V. Anderson hide caption

itoggle caption Courtesy of Christopher V. Anderson

A technician at pharmaceutical company pursuing new gene therapy treatments collects re-engineered viruses, called "vectors." Viruses, stripped of their virulence and ability to replicate, are the most common delivery vehicles for healthy DNA. Paul Sakuma/AP hide caption

itoggle caption Paul Sakuma/AP

As temperatures drop during the winter months, female mosquitoes like Culex pipiens gain weight to conserve energy. iStockphoto.com hide caption

itoggle caption iStockphoto.com

These mutant nematode worm embryos are genetically identical, but fluorescence imaging shows they are not exactly the same. The pink spots are mRNA molecules involved in gut development. Some twins have spots and some don't, which means some will develop guts and others won't. Arjun Raj hide caption

itoggle caption Arjun Raj

A technician works on a Toyota Prius hybrid at a production facility in Aichi Prefecture, Japan. According to experts, cars like the Prius are the next step in a future that's moving toward vehicles with more robotic-type control systems that can analyze driving conditions and act accordingly. Kyodo/AP hide caption

itoggle caption Kyodo/AP

A thin (0.1 mm) layer of water that is frozen and examined under polarized light. Courtesy of Rainer Stahlberg and Gerald H. Pollack, University of Washington hide caption

itoggle caption Courtesy of Rainer Stahlberg and Gerald H. Pollack, University of Washington