Jim Al-Khalili is about to untangle the world''s greatest science conundrums...
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How does the fact that it gets dark at night prove the Universe must have started with a big bang?
Where are all the aliens?
Why does the length of a piece of string vary depending on how fast it is moving?
Our subject is ''perceived paradoxes'' - questions or thought-experiments that on first encounter seem impossible to answer, but which science has been able to solve.
Our tour of these mind-expanding puzzles will take us through some of the greatest hits of science - from Einstein''s theories about space and time, to the latest ideas of how the quantum world works. Some of our paradoxes may be familiar, such as Schr-dinger''s famous cat, which is seemingly alive and dead at the same time; or the Grandfather Paradox - if you travelled back in time and killed your grandfather you would not have been born and would not therefore ha
