The probability of drawing unique names in a secret Santa is an alternating series that eventually converges at 1/e. (Obvious once I realised that it is related to derangements).
Individual African elephants can have different numbers of ribs.
Found a neat way of explaining !n.
Catnip can for some cats be a calming influence.
The large blue butterfly caterpillar is adopted by ants and feeds on ant larvae until it metamorphosises.
Michael Bear is the present Lord Mayor of London (not to be confused with Boris, the Mayor of London).
Rupert the bear was 90 this year.