[S1 Science: Magnetism] How do you think the ballerina spins? It's pretty deceptive, hiding a magnet behind the mirror like that. And here I was, trying to recreate the spinning-in-front-of-a-mirror at home! (It's not a fun experience, I fell onto the floor a couple of times and my palms hurt like I've rocks tied to them, don't try this.)

[PSLE Maths and up: Mathematical Modelling] So: Popular demand has answered, here's another post on mathematical modelling. You might notice something unusual: Yes, it's the same problem! Driving further for cheaper rice, or driving less for more expensive rice again. But, it's been presented by a different individual, and the feel of the presentation is different as a result. In Maths, it's important to take into account multiple viewpoints. Even if they seem to be looking a