explainer

  • What is light?

    Electromagnetic wave, photons… What does all this mean?

    Imagine you’re in a park, looking at a leaf on the branch of a tree. We know light bounces off the leaf to your eye t...

    Physics June 13, 2016
  • How do fingerprint scanners work?

    They identify you from the unique pattern of ridges and grooves on your fingertips, but there are...

    Fingerprint scanners are used everywhere, from airport and prisons to mobile phones.UNITED STATES MARSHALS SERVICEIn ...

    Technology June 1, 2016
  • How do fibre optic cables work?

    Working at near the speed of light and sending billions of bits of data across the world, the fib...

    Manuela Schewe-Behnisch / EyeEm / Getty ImagesWhen you flip a light switch, light is projected from a bulb and transm...

    Technology May 18, 2016
  • How do radar and stealth work?

    Developed to track planes in wartime, radar forms the basis of modern-day auto-braking, missile d...

    Though development and manufacture began in 1978, the F-117 was not unveiled to the public until 1990. The unusual de...

    Technology May 11, 2016
  • How does a Geiger counter work?

    Measuring radiation is a simple matter of counting.

    Click, click, click. The sound of a Geiger counter is often associated with nuclear weapons and fallout. While it is ...

    Technology April 27, 2016
  • How do Tasers work?

    They deliver a short, sharp zap using a combination of pressurised gas, electricity and simple sc...

    The Taser International X26 taser gun with cartridge and spent probes. The probes have thin insulated wires attached ...

    Technology February 9, 2016
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