What are gravity waves?

21 March 2014
Presented by Chris Smith, Redi Tlhabi.

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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