Measurement is at the heart of science – a point that we could probably do with reiterating to our students on a regular basis. This video, by the appropriately named Marshall Brain, founder of howstuffworks.com, contains some great ideas for easy-to-do activities which should be ideal for Year 7 (or even KS2 students). I don’t recommend showing the video to your students – this is one of those videos that’s worth watching to get ideas to do “for real” in the classroom.