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...simple test which can tell if you've found a rock - or something extra-terrestrial, explains meteorite hunter Rob Elliott...Meteorites come in all shapes and sizes but the small pieces greatly outnumber the larger pieces. They are rarely much larger than a small melon, and with this in mind, you should keep your eyes trained for small rusty looking rocks, perhaps even...

...simple traits which have a strong genetic basis, like eye colour. But other traits, like preferring chocolate over vanilla ice cream, depend on lots of genetic changes and environmental factors that the tests miss out, and so the results are likely to be inaccurate. DTC tests can also tell us things about our health by checking our DNA for changes which increase our risk...

...simple ‘banger’ comprises the blue touchpaper that is impregnated with potassium nitrate, which smoulders when lit. This reaches a sulfurless priming powder, which is a mixture of potassium nitrate and charcoal. This then ignites a delay fuse, which burns noisily until the end is reached. Smoke, flame and hot particles are then showered onto the main gunpowder...