What are gravity waves?

Is gravity waves from the Big Bang a big deal? Is evolution still occurring? Why does water boil at lower temperature at altitude?
21 March 2014
Presented by Chris Smith, Redi Tlhabi

NASA-WMAP-first-stars.jpg

The first stars in the Universe turn on at about 400 million years after the Big Bang. WMAP data reveals the era.

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Is gravity waves from the Big Bang a big deal? Is evolution still occurring? Why does water boil at lower temperature at altitude? Can the brain be hitched up to control a computer? Are power lines bad for your health? Will sleeping with the light on harm health? How accurate is a medical syringe? And why does spinning around make me dizzy?

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