Practical magic?

At my old school, I could set up this sort of thing with my eyes closed and both hands tied behind my back but the equipment is all very different here so it’s a little stressy at the moment when I have to do any practicals. Thankfully, our science technicians are amazing and set this demo up for me. In return, I bought them donuts.

On one of the really hot days (and didn’t we have a lot of those?!?), one of the technicians brought in ice cubes for a different practical. There were loads so I gave all the students one to play with!