Why can't my cat catch my cold?

Why do we develop allergies? Which tectonic plates caused the Nepalese earthquake?
01 May 2015
Presented by Chris Smith, Redi Tlhabi

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Why do we develop allergies? Which tectonic plates caused the Nepalese earthquake? Could we use a car to generate electricity? Why can't my cat catch my cold? Plus, the effects of radiation in space on astronauts' brains...

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