Posted on 10 January 2012 at 17:39h

Do you ever tell your class something and then think “that was a load of nonsense”. Today I told them that sweating makes you cool but it doesn’t really does it, well not in that sense at least. I once said you can’t see light when it’s actually the only thing you can see. What I meant was that you can’t see that light is a wave in the same way as you can see a water wave but that’s not how it came across. The sweating example is of course about losing heat rather than being cool. Whilst on the subject I once had quite a cool car, well I thought it was cool at least and I built it myself so that has to add some coolness points. It was a Spartan kit car based on a triumph spitfire. On the surface it was brand new but underneath was a scrap heap. One summer day I was driving along and realised there was a strong smell of petrol so after a couple of miles I pulled in and had a look under the bonnet to be surprised to find an icicle hanging there. What had happened was that the petrol pipe had sprung a leak and started squirting petrol everywhere, this vaporised causing the surrounding area to cool down. Water condensed on the cold area and turned to ice.