The suggestion box -- Some useful stuff -- Arithmetricks -- The formula board -- Pytho power -- When does 9-11=10? -- How far away is the horizon? -- How fast does the moon move? -- The Great Rhun and the box of one year's delight -- Calendar chaos! -- What is the very smallest measurement? -- How can you make a liar tell the truth? -- How far does a water current make you drift off course? -- What is the biggest shape you can put a fence around? -- How many snaps does it take to break up a chocolate bar? -- How many different nets of a cube are there? -- Did Dolly diddle the dodgy diamonds? -- Why can't you get a giant people-eating spider? -- What's that nasty thing in the basement? -- How many people in the world share your birthday? -- The shortest link -- A lot of hot air -- How do you make a perfect kite shape quickly? -- What is the biggest number? -- The curry burger problem -- How high is a kite? -- Can one giant sneeze blast the Earth out of orbit? -- The mysterious handcuffs -- Some unexpectedly evil football sums -- How much of Archimedes' bathwater is in every glass of water you drink? -- Goodbye!