Fast-twitch muscles are responsible for high-intensity work like heavy lifting and sprinting. Here's how to build them and keep them healthy.

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Cosmic Rays, gamma rays, muons, ultra-energetic particles. Read all the current news and research on cosmic rays. Full-text astronomy articles with images, free.

Black Holes in Space. Read science articles on colliding supermassive black holes, simulated gravitational waves of a black hole, black hole theory and more. Astronomy images.