Butler picked his principal up and gave him a perfunctory examination. 'Everything is in the right place. Nothing broken. Now, Artemis, tell me, what is twenty-seven multiplied by eighteen point five?'
Artemis straightened his suit jacket. 'Oh, I see, you're checking my mental faculties. Very good. I suppose it's conceivable that time travel could affect the mind.'
'Just answer the question!' insisted Butler.
'Four hundred and ninety-nine point five, if you must know.'
'I'll take your word for it.'

The Lost Colony, Chapter 1