Roger Highfield in The Telegraph:
The non-popping balloon
How do you stop a balloon held under a candle from popping? The answer is simple and the science behind it compelling. This experiment was suggested by the author of Quirkology, Prof Richard Wiseman from the University of Hertfordshire. It shows the power of water to absorb heat, a fact which drives the world’s weather.
Measuring the speed of light
It is the fastest thing in the universe and, remarkably, you can measure it in your own home. This experiment comes from Simon Singh, best selling author and physicist. The amazing thing is that all you need is a microwave, a ruler and some chocolate buttons.