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Timings where shown are from the start of the programme in hours and minutes How Long is a Piece of String? When Alan attempts to measure his string at the atomic scale, events take an even stranger turn. Not only do objects appear in many places at once, but reality itself seems to be an illusion. Ultimately, Alan finds that measuring his piece of string could - in theory at least - create a black hole, bringing about the end of the world. Chapters 1.

Chapter 1 How Long is a Piece of String? However, this creates more questions, which requires a trip to a place dedicated to measurement, the National Physics Laboratory. Chapter 3 Infinitely Long String Finding out the exact length of the string proves even more troublesome when Marcus proposes the string could be infinitely long, thanks to the theory of fractals. Chapter 4 A Physics Approach After leaving Marcus, Alan visits a physics teacher to see if measuring the string in atoms can help him find an answer.

However, this means exploring Quantum Mechanics. Chapter 5 Two Places at Once Alan goes to a lab to explore the theory of Quantum Mechanics in more detail to see if his string can be in two places at once, confusing him even further. Chapter 6 Dead or Alive? Still no closer to an answer Alan is introduced to the theory that his string may have multiples lengths at the same time, all with the help of a stuffed cat.

Chapter 8 End of the World If Alan was to find the most accurate way of measuring his string he could theoretically create a black hole. Chapter 9 Final Summary Trying to find the solution to this question has been a philosophical journey for Alan, but he still visits Marcus du Sautoy to tell him his personal answer.

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