Endothermic reactions

Such fun on a Wednesday evening, don't you agree? I did quite a bit of revision tonight and am happy with myself for doing so. The weather shocking though and poured of rain pretty much all night so I didn't really have much else to do anyway...

I must say thank you so much for how you received yesterday's photo. My goodness! It hit 'Explore' on Flickr and 'Spotlight' on Blipfoto!