QUESTIONS

Q : Why are certain artillery weapons called ‘recoilless rifles’, when they are not rifles at all? Dennis Nisbet, Whickham, Tyne & Wear.

Q : Why is it illegal to vape in Thailand?

Paul Bruce, Newcastle upon Tyne.

Q : In the Merchant Navy crossing the North Atlantic, when we sailed through curtains of aurora borealis we could hear a crackle. What might this have been?

B. Scott-Brown, Callander, Perthshire.