SLAC Today is available online at:
http://today.slac.stanford.edu
In this issue:
Dark Matter—What's Out There?
Safety Today: Protect Against Skin Cancer
Keep Your Cash and Valuables Locked Up
Word of the Week: "Emittance"
Safety Seconds
Tuesday - August 7, 2007 |
Dark MatterWhat's Out There?For thousands of years, people have gazed at the stars and wondered, "What's out there?" But it wasn't until the 1930s that anyone realized there is much more out there than meets the eye. Recent observations have proven that about 22 percent of the universe is made out of a "dark matter" that is like the wind—although invisible, its influence can be seen. In a recent paper, SLAC Theoretical Physicist Michael Peskin provides an overview of how scientists are trying to unlock the mysteries of dark matter. Although there are many theories regarding dark matter, one of the popular claims suggests that dark energy is a Weakly Interacting Massive Particle (WIMP). These hypothetical particles rarely interact with visible matter, making them extremely difficult to detect outside of a particle accelerator. WIMPs have not yet been seen in particle accelerators, but that could soon change. "Scientists have been working on dark matter questions for a long time," said Peskin. "But now the work is all coming to a head." Read more... |
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Protect Against
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Keep Your Cash and Valuables Locked UpSLAC Site Security has received three reports of cash missing from unlocked offices within the past few days. SLAC security officers are investigating the circumstances of these incidents. "Please lock away your purses and wallets, and be certain your office and/or desk is locked when you are not around. These are the best ways to protect your belongings," says Simon Ovrahim, SLAC Site Security Manager. Word of the Week:
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