The Doctor and her new best friends are stuck on a planet that wants to kill them – pretty standard. But what did our team make of The Ghost Monument? Let’s find out…
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Check out the first in our series of articles looking at some of the math and science featured in Doctor Who.
In this article, Ifan looks at one of the quiz questions from the SS Pentallian's quiz (from the Series 3 episode 42) and explains how to get the answer by and just what exactly 'happy primes' are.