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Horizon
S47E6 · How Long is a Piece of String?
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Episodes
E1
E1
Do I Drink Too Much?
2009-10-13
E2
E2
The Secret You
2009-10-20
E3
E3
Fix Me
2009-10-27
E4
E4
Who's Afraid of a Big Black Hole?
2009-11-03
E5
Why Do We Talk?
2009-11-10
E6
E6
NOW
How Long is a Piece of String?
2009-11-17
E7
E7
The Secret Life of the Dog
2010-01-06
E8
E8
Why Do Viruses Kill?
2010-01-13
E9
E9
Pill Poppers
2010-01-20
E10
E10
Don't Grow Old
2010-02-03
E11
E11
To Infinity and Beyond
2010-02-10
E12
E12
What Makes a Genius?
2010-02-17
E13
E13
Did Cooking Make Us Human?
2010-03-02
E14
E14
Is Everything We Know About the Universe Wrong?
2010-03-09