In order to differentiate and specialize, stem cells require very specific environmental cues in a very specific order, and scientists have so far been unable to prod them to go through each of the necessary steps. But now, for the first time, a study in mice by Rockefeller University scientists shows that embryonic stem cells implanted in the brain appear to develop into fully differentiated granule neurons, the most plentiful neuron in the cerebellum. The findings were reported Feb.

Instruments known as solid-state telescopes (SSTs), built with detectors fabricated at Lawrence Berkeley National Laboratory and carried aboard the recently launched THEMIS mission, have delivered their first data on how charged particles in the solar wind interact with Earth's magnetic field to shape the planet's magnetosphere.

THEMIS's principal investigator is Vassilis Angelopoulos of the University of California at Berkeley's Space Sciences Laboratory (SSL), which is leading the mission for NASA and which designed and built the instruments in collaboration with agencies in Germany, France, and Austria.

One of the five THEMIS spacecraft prior to launch.

The Internet is enough of a marvel that most people would never ask, "Is this really how we would build it if we could design it all today?" But asking that very question is the job of a broad-based team of Stanford researchers. Taking a nothing-is-sacred approach to better meet human communications needs, this month they are launching a new program called the Clean Slate Design for the Internet. They will present their ideas March 21 during a daylong workshop at the annual meeting of the Stanford Computer Forum.

"How should the Internet look in 15 years?" asks Nick McKeown, an associate professor of electrical engineering and computer science who is leading the effort.

Tiny tremors and temblors recently discovered in fault zones from California to Japan are generated by slow-moving earthquakes that may foreshadow catastrophic seismic events, according to scientists at Stanford University and the University of Tokyo.

In a study published in the March 15 issue of the journal Nature, the research team focused on weak seismic signals known as "non-volcanic tremor" and "low-frequency earthquakes," which seismologists say may be useful in forecasting the likelihood of potentially destructive mega-quakes of magnitude 8 or higher.

"Non-volcanic tremor is a weak shaking of the Earth that was discovered about five years ago in Japan," said Gregory C. Beroza, professor of geophysics at Stanford and co-author of the Nature study.

Instruments on NASA's Cassini spacecraft, part of the joint NASA/ESA/ASI Cassini-Huygens mission to Saturn and its moons, have found evidence for seas, likely filled with liquid methane or ethane, in the high northern latitudes of Saturn's moon Titan.

One such feature is larger than any of the Great Lakes of North America and is about the same size as several seas on Earth.

This image of Saturn’s largest moon, Titan, obtained by Cassini's radar instrument during a near-polar flyby on 22 February 2007, features dunes and lakes, one of which is larger than any lake on Earth and could be legitimately called a sea. Titan’s lakes are thought to consist of liquid methane and ethane.

The problem of efficiently delivering drugs, especially those that are hydrophobic or water-repellant, to tumors or other disease sites has long challenged scientists to develop innovative delivery systems that keep these drugs intact until reaching their targets.

Now scientists in the University at Buffalo’s Institute for Lasers, Photonics and Biophotonics and Roswell Park Cancer Institute have developed an innovative solution in which the delivery system is the drug itself.