My new career

Having had the "Can you cover?" e-mail yesterday, there I was brushing up my mathematical skills to find that, for the day, I was a Biology teacher. No problems - sit at the front and say "Get on with this." No different to maths at all. And you get the bonus of those interesting facts all around the lab to read. 
Such a stressful day that we had to head off to the Westford in the evening.