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Semen quality may start to decline in one's 20s

With each passing year, semen quality in adult men declines, suggesting that age plays a greater role in male fertility rates than previously thought, according to a new study by researchers at the University of California, Berkeley, and Lawrence Livermore National Laboratory. The study, published Thursday, Feb. 6, in the journal Human Reproduction, suggests that even healthy men may become progressively less fertile as time goes by.

Zooming-in on star formation in the Orion Nebula

A team of astronomers is using one of the most advanced ground-based telescopes in the world to "zoom-in" on protostars in the Orion Nebula, revealing in unprecedented detail a variety of phenomena associated with star and planet formation in the presence of extremely massive, luminous stars. These phenomena include high-velocity jets of gas launched from the protostars themselves; evaporation flows driven by the intense radiation of nearby massive stars; and colliding winds that form thin, filamentary sheets of gas.

Researchers Apply Combat Simulation Technology to Homeland Security

Using a computer code originally developed for combat simulation, researchers from the Lawrence Livermore National Laboratory are supplying the same expertise that analyzes concepts of operation, technology and training to emergency responders as a part of the Lab's role in homeland security. The Analytical Conflict and Tactical Simulation (ACATS) is an offshoot of the Joint Conflict and Tactical Simulation (JCATS) that the military uses for training, analysis, mission planning and mission rehearsal. JCATS also has been used to support actual military operations in places such as Panama and the Persian Gulf.

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