At Lawrence Livermore's National Atmospheric Release Advisory Center, scientists use sophisticated computer-modeling techniques to predict and plan for nuclear, chemical or biological catastrophes. Visitors will view big-screen animated simulations of worst-case scenarios, including volcanic eruptions and the meltdowns at Chernobyl and Three Mile Island. They can also take a bus tour of nearby Site 300, where LLNL researchers conduct non-nuclear explosives tests (although they won't blow anything up for you-we asked). TRIP TIP:At the National Ignition Facility, you'll see technicians at the controls of the world's largest and highest-energy laser and get the lowdown on the quest for hydrogen fusion. INFO: Free; ages 18 and up; for reservations, call the Public Affairs Office at 925-422-4599; llnl.gov/about/tours.html
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