Caltech researchers successfully raise obeliskwith kite to test theory about ancient pyramids

When people think about the building of the Egyptian pyramids, they probably have a mental image of thousands of slaves laboriously rolling massive stone blocks with logs and levers. But as one Caltech aeronautics professor is demonstrating, the task may have been accomplished by just four or five guys who flew the stones into place with a kite.

Hensen's node in chicken embryos governs movement of neural cells, study shows

For us living creatures with backbones, existence begins as a single fertilized cell that then subdivides and grows into a fetus with many, many cells. But the details of how those cells end up as discrete organs instead of undifferentiated heaps of cells is only now being understood in microscopic detail.

Why, for example, should some of the cells migrate to the region that will become the brain, while others travel netherward to make a spinal cord?

Caltech Uses Fluorescent Protein to Visualize the Work of Living Neurons

Proving that protein synthesis occurs in intact dendrites

Brightest Quasars Inhabit Galaxies withStar-Forming Gas Clouds, Scientists Discover

A team of scientists at the California Institute of Technology and the State University of New York at Stony Brook has found strong evidence that high-luminosity quasar activity in galaxy nuclei is linked to the presence of abundant interstellar gas and high rates of star formation.

In a presentation at the summer meeting of the American Astronomical Society, Caltech astronomy professor Nick Scoville and his colleagues reported today that the most luminous nearby optical quasar galaxies have massive reservoirs of interstellar gas much like the so-called ultraluminous infrared galaxies (or UL

Biochemical "On/Off" Switch Discovered

PASADENA, Ca.— Proteins are the cell's arbiters. In a complex and still largely mysterious cascade of events, proteins tell a cell when to divide and grow—and when to die. To properly control cell behavior, proteins need to be turned on when they are needed, and turned off when they are not. Now a California Institute of Technology biologist and his colleagues have shed important new light on how this takes place in animals and plants.

Environmental Study of Local Area Conducted by Caltech Team

California Institute of Technology researchers have received a $100,000 grant from the Alice C. Tyler Perpetual Trust to study the human impact on land and water in the San Gabriel Valley and San Gabriel River watershed. Ecosystems bordering major metropolitan areas are subject to intense pressures from pollutants produced by transportation, industrial activities, power generation, and recreational activities. This project will measure and document these environmental changes in order to predict future impacts.

New Analysis of BOOMERANG Data Uncovers Harmonics of Early Universe

Cosmologists from the California Institute of Technology and their international collaborators have discovered the presence of acoustic "notes" in the sound waves that rippled through the early universe.

The existence of these harmonic peaks, discovered in an analysis of images from the BOOMERANG experiment, further strengthens results last year showing that the universe is flat. Also, the new results bolster the theory of "inflation," which states that the universe grew from a tiny subatomic region during a period of violent expansion a split second after the Big Bang.

Scientists achieve breakthrough in fuel-cell technology

Gasoline averaging $3 per gallon? Oil drilling in an Alaskan wildlife reserve? A need to relax air quality standards? It seems the long-term future of fossil fuels is bleak. One promising solution scientists have been studying is fuel cells, but they've had limitations too. Now, in the April 19 issue of the science journal Nature, the California Institute of Technology's Sossina M. Haile reports on a new type of fuel cell that may resolve these problems.

Scientists Watch Dark Side of the Moon to Monitor Earth's Climate

Scientists have revived and modernized a nearly forgotten technique for monitoring Earth's climate by carefully observing "earthshine," the ghostly glow of the dark side of the moon.

Earthshine measurements are a useful complement to satellite observations for determining Earth's reflectance of sunlight (its albedo), an important climate parameter. Long-term observations of earthshine thus monitor variations in cloud cover and atmospheric aerosols that play a role in climate change.

Owls perform a type of multiplicationin locating ground prey in dark, study shows

Owls have long been known for their stunning ability to swoop down in total darkness and grab unsuspecting prey for a midnight snack.

In the April 13 issue of the journal Science, neuroscientists from the California Institute of Technology report that an owl locates prey in the dark by processing two auditory signal cues to "compute" the position of the prey. This computation takes place in the midbrain and involves about a thousand specialized neurons.

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