It started off as a lesson about touch. Theo's meant to be looking at the five senses this week, you see, so we've had a bit of fun with tasting food while blindfolded, and guessing the smells. Today was the sense of touch, so I thought, "Ah yes, those touchy-feely boxes." Then I thought, "How about jelly?" Then I thought, "Gels. Foams. Aerosols. All sorts of fun stuff!" And quite frankly, if having a chemistry degree doesn't mean you teach your kids about colloids and viscosity by the age of 10, then what is the point? So for colloids, we had green jelly, blue shower gel, shaving foam and yoghurt. (Is yoghurt a colloid? I'm pretty sure it is.) Otherwise known as lots of lovely gloop. If you missed that bit of your education, a colloid is basically one state of matter dispersed in another one. So you can have a solid mixed with a liquid, which gives you something like shower gel, jelly, or yoghurt; or liquid mixed with g...
Getting through life one cake at a time.