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  • How Smart Are Dolphins? These brainy marine mammals can “read,” plan ahead, and communicate in astounding ways. See them read.

  • Origins of the Solar System The shock wave from a supernova may have triggered the formation of our sun and planets five billion years ago. Watch now.

  • The Psychology of Spaceflight NASA psychologist Al Holland says that a three-year return trip to Mars would be a mental challenge for any astronaut. Listen.

  • A One-Way Trip to Mars? Initial shock aside, some space scientists argue this is the only way to go. Go to Mars. NASA

  • Human Hibernation Medical researchers and emergency room doctors are testing therapies that cool down patients to save their lives. Chill out.

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