Two snakes get off the ark and are told by Noah that they must 'go forth and multiply'.
A week later they return crestfallen, Noah asks them why? 'We cannot multiply' says one. 'Why not?' asks Noah.
'Because we are adders' says the other..
'Go away and think about it', replies Noah..
A week later they return triumphant.
'Well, how did you do it?' asks Noah.
'We used a Log'....
Maths teachers eh...