https://youtu.be/c-r8LKosap4 A surprise find of blue wine in the washing up opened up a world of chemistry in the kitchen. Turns out red wine and purple cabbage show amazing colours as you change their acidity. They are acid-base indicators, due to chemicals called anthocyanins.
By popular demand, explosions with actual yoghurt. Or not? Dr Phil vs science, who will win? https://www.youtube.com/watch?v=3AlMi3P6BkY