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...Health Organisation says that 105 boys are born for every 100 girls, and in some countries the ratios are more extreme, for example up to 120 boys born for every 100 girls. You can visualise this by dividing the group into men and women. If the ratio is 105 to 100, then if there were 105 in the males group, there’d be 100 in the females group. Mathematically, you would...

...mentally compare with other distances in the Solar System!). In all sciences it is extremely important to state the units of any quantity. This is particularly true in astronomy, where the numbers can be very different if expressed in everyday units...Week 2: Planets, large and small: 3 Gas giants and ice giants - The outer regions of the four giant planets in the Solar...

...mental disorders: the word ‘lunacy’ is derived from ‘lunar’. This is reflected in popular culture – for example, the character Luna Lovegood in the Harry Potter books. Another rich area of cultural references to the Moon comes from the story of a simpleton trying to recover a large cheese, really a reflection of the Moon, from a lake. The story is present in the...