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Smokescreens in science and technology
Despite what military technology claims, invisibility remains a matter of perspective, write ROX MIDDLETON, LIAM SHAW and JOEL HELLEWELL
A photo portrait of Alfred Nobel (1833-96)

MUCH of Britain enjoyed explosives this weekend in bonfire night celebrations. If you want to make fireworks at home, you can. 

Without any legal hassle, you’ve got the right to use up to 100g of gunpowder which those in the know call “black powder.” 

You can either prepare it yourself using a chemistry recipe (there is a wikihow guide), or you can buy it online, for example imported from Germany or China. 

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