It's what you've all been waiting for: the sneaky preview of issue 3 on sale 31 December The jet engine explained Discover how oilrigs extract oil from the seabed Sharks – all you'll ever need to know about these underwater killers We take an in-depth look at the classic Spitfire fighter plane And ...

If you haven't yet got your copy of issue 2 of How It Works, here's a small selection of our favourite features to whet your appetite. Don't deprive yourself – feed your mind. It's on sale till the end of the year. We take a look inside the most advanced battle tank in the world The largest X-ray generator on Earth, explained...