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2. Nebo-M - Wikipedia

   en.wikipedia.org/wiki/Nebo-M

   As a system, Nebo-M is a complex which features different radars. From the beginning, Nebo-M represented a modification and modernization of older VHF band Nebo SVU, L-band Protivnik G, and S/X-band Gamma S1 radars on mobile chassis. The designations of the newer variants are RLM-S, RLM-D, RLM-M, and the command post KU-RLK.

3. Mechanically powered flashlight - Wikipedia

   en.wikipedia.org/wiki/Mechanically_powered...

   A dyno torch, dynamo torch, or squeeze flashlight is a flashlight or pocket torch which generates energy via a flywheel. The user repeatedly squeezes a handle to spin a flywheel inside the flashlight, attached to a small generator/dynamo, supplying electric current to an incandescent bulb or light-emitting diode. The flashlight must be pumped ...

4. Flexible battery - Wikipedia

   en.wikipedia.org/wiki/Flexible_battery

   Flexible Li batteries have been embedded into dental braces for powering light-emitting diodes in light-assisted therapy A flexible lithium-ion polymer battery. Flexible batteries are batteries, both primary and secondary, that are designed to be conformal and flexible, unlike traditional rigid ones. They can maintain their characteristic shape ...

5. Flashlight - Wikipedia

   en.wikipedia.org/wiki/Flashlight

   Formerly, the light source typically was a miniature incandescent light bulb, but these have been displaced by light-emitting diodes (LEDs) since the early 2000s. A typical flashlight consists of the light source mounted in a reflector, a transparent cover (sometimes combined with a lens ) to protect the light source and reflector, a battery ...

6. Why we need vitamin D — and sun exposure isn't the only way ...

   www.aol.com/lifestyle/why-vitamin-d-sun-exposure...

   There are several reasons why — the main factors being lack of sun exposure (the body produces vitamin D when exposed to the sun’s ultraviolet light), location, age and skin color, explains ...

7. Light-emitting diode - Wikipedia

   en.wikipedia.org/wiki/Light-emitting_diode

   A light-emitting diode (LED) is a semiconductor device that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, ...