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	Podcast:		The Reith Lectures
	Episode:		What We'll Never Know
	Category:		Society & Culture
	Duration:		00:41:45
	Publish Date:		2010-06-15 03:45:00
	Description:		3. What We'll Never Know In the third of this year's Reith Lectures, recorded at the Royal Society during its 350th anniversary year, its President Martin Rees continues to explore the challenges facing science in the 21st century. He stresses there are things that will always lie beyond our sphere of comprehension and we should accept these limits to our knowledge. On the other hand, there are things we've never even dreamt of that will one day be ours to explore and understand. The outcome of the quest for alien life will revolutionise our sense of self in the next two decades. But some things -- like travelling back in time -- will never happen.
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