The Science of DeductionSteven Moffat: Oddly enough, the thing [our kids] really enjoyed were the deductions. They were very, very hard to write.
Mark Gatiss: That's why Conan Doyle stopped bothering.
Steven Moffat: Or they become rubbish. 'How did you know I was on the train?' 'I saw your train ticket!'
Mark Gatiss: 'I was sitting next to you on the train!'