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Electrodeless lamp - In contrast with all other electrical lamps that use electrical connections through the lamp envelope to transfer power to the lamp, in electrodeless lamps the power needed to generate light is transferred from the outside of the lamp envelope by means of (electro)magnetic fields. Two systems are described below - one based on the conventional fluorescent lamp phosphors, and a second based ...
Hip replacement - Hip replacement is the most successful, cheapest and safest form of joint replacement surgery. The earliest recorded attempts at hip replacement (Gluck T, 1891), which were carried out in Germany, used ivory to replace the femoral head (the ball on top of the thighbone).
Carbon button lamp - The carbon button lamp is a single-electrode incandescent lamp invented by Nikola Tesla during his effort to get around the Edison patent for the incandescent light bulb. A carbon button lamp contains a small carbon sphere positioned in the center of an evacuated glass bulb.
NEC PC-8801 - The NEC PC-8801 system was introduced by the NEC Corporation in 1981 and was an early Zilog Z80-based computer. The NEC PC-8801 became very popular in Japan, but was never released anywhere else.
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