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In this issue, discover the future drones that can deliver goods, evacuate injured soldiers, and help farmers.

Also, view the biggest black holes in the universe (from a safe distance), how a hangover affects the body, how modern military radar works, why the dead sea is dead, and much more.

For more science and technology articles, pick up the latest copy of How It Works from all good retailers or from our website now. If you have a tablet or smartphone, you can also download the digital version onto your iOS or Android device. To make sure you never miss an issue of How It Works magazine, subscribe today!