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The brain can not only change itself, but it can also heal itself in ways we never thought were possible. Dr. Norman Doidge looks at how energy - light, sound, electricity, and motion - awaken the brain's own capacity to heal.
The story of a natural disaster and how Californians are responding as they face a water level that is dropping to zero.
Scientists, dreamers, and billionaires are rushing to put humans on the red planet. Not just in the future, but now. Will Mars be our new home? The journey has begun.