How It Works Issue 129

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Published 5th September

Discover how 5G network technology goes way beyond simply streaming video faster on your mobile phone, and why this reliable and super-quick standard is itself a technology enabler: driverless cars, surgeons performing remote medical procedures, adverts on any surface, and 5G virtual lessons in a classroom near you. Also in this issue, discover how time travel is possible in our guide to the theories of relativity, how scientists detect blood-doping sports cheats, what permafrost is, how a lie detector works, and NASA's latest line of human habitats on Mars.