Just as I sat down, Mr T asked if I'd heard of amplitude (I had) and made a wave motion with my hand which baffled him no end..."So it's not the same at Altitude then?", to which I pointed high in the sky and said no - we both agreed they didn't have the same number of letters so only one answer could be correct for his crossword. And so concluded today's physics lesson.

We then got onto Scottish weather (it's freezing up there at the moment), and the word "Dreich", which perfectly describes 99% of Scottish weather (even he agreed on this observation...). Not for the first time my visit to Tesco/Lidl was incidental to most of today's mission!