After a 10-year break, the Royal Institution's Christmas Lectures return to the BBC.
This year they are presented by materials scientist Dr Mark Miodownik. The question the three lectures are asking is: does size matter?
We got an exclusive sneak preview behind the scenes as the TV crews rehearsed the second lecture, and a guided tour of the RI's prep lab where the experiments and props are built and tested.
You can watch the finished Size Matters lectures on 28, 29 and 30 December at 8pm on BBC4.
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