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The World Cup is in full swing, complete with an official new soccer ball named Jabulani, meaning "to celebrate" in Zulu. The players, however, aren't exactly celebrating. Instead, many of them are complaining that the ball's trajectory is too hard to predict. So what exactly is it about the new ball that's provoking all the controversy? To find out, Caltech engineers put an official Jabulani through its paces in the Lucas Adaptive Wall Wind Tunnel.

Deep in a mine 230 stories underground, physicists are trying to detect dark matter, the mysterious stuff that makes up nearly a quarter of the universe. Last December, tantalizing rumors of a major discovery by the Cryogenic Dark Matter Search (CDMS) set the physics world abuzz. The Caltech collaborators describe their experiment. 

Taking inspiration from a popular executive toy ("Newton's cradle"), researchers at Caltech have built a device—called a nonlinear acoustic lens—that produces highly focused, high-amplitude acoustic signals dubbed "sound bullets." The acoustic lens and its sound bullets (which can exist in fluids—like air and water—as well as in solids) have the potential to revolutionize applications from medical imaging and therapy to the nondestructive evaluation of materials and engineering systems.

A constellation of Caltechers has been honored this week by the Astronomical Society of the Pacific, the world's largest general astronomy society. The ASP announced eight 2010 awards for "excellence in astronomy research and education," four of them recognizing people and programs affiliated with the Caltech community.

Producing coherent light on a microchip is old hat—LED lasers underpin our high-tech world, appearing in gadgets ranging from DVD players and supermarket checkout scanners to digital data lines. A new chip-compatible component developed at Caltech can produce coherent sound as well, and even interconvert the two. Who knows where this marriage of sound and light might lead?

Caltech's H. Jeff Kimble named National Security Science and Engineering Faculty Fellow.

Astronomers from Caltech and other institutions, using the highly sensitive 10-meter Keck I telescope atop Hawaii's Mauna Kea, have detected an extrasolar planet with a mass just four times that of Earth. The planet, which orbits its parent star HD156668 about once every four days, is the second-smallest world among the more than 400 exoplanets (planets located outside our solar system) that have been found to date.

Researchers at the Caltech have proposed a new paradigm that should allow scientists to observe quantum behavior in small mechanical systems. Their ideas, described in the early online issue of the Proceedings of the National Academy of Sciences, offer a new means of addressing one of the most fascinating issues in quantum mechanics: the nature of quantum superposition and entanglement in progressively larger and more complex systems.

Saturn's largest moon, Titan, looks to be the only place in the solar system—aside from our home planet, Earth—with copious quantities of liquid (largely, liquid methane and ethane) sitting on its surface. According to Caltech planetary astronomer Mike Brown, Earth and Titan share yet another feature, which is inextricably linked with that surface liquid: common fog.