LLNL announces a new tsunami warning system using the world's fastest supercomputer, El Capitan, for real-time forecasts.

The El Capitan Theatre was buzzing as D23 fans got an exclusive first look at "Alien: Earth" during a special early screening ...

The computer weighs 1.3-million pounds, the same as four blue whales or 100 African elephants – and it's right here in the ...

Scientists at Lawrence Livermore National Laboratory (LLNL) have helped develop an advanced, real-time tsunami forecasting ...

Yosemite National Park, nestled in California’s Sierra Nevada Mountains, is one of America’s most treasured natural wonders, ...

An 11-year-old Colorado climber made history as the youngest American to summit the Matterhorn. David Muir talks with the father-son duo about their remarkable journey.

El Capitan is Apple’s marketing name for OS X version 10.11, the latest update to your Mac’s system software. If your Mac is running Yosemite (10.10), Mavericks (10.9), or Mountain Lion (10.8 ...

The El Capitan public beta lets you use the major new version of OS X before itu2019s formally released. We've got answers to your questions about the beta program.