Karel Vacha
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14 Feb 39: The great German battleship BISMARCK is launched, the most powerful ship in the Kriegsmarine. Its career on the seas, however, will be cut short by the British. More: http://scanningwwii.com/a?d=0214&s=390214 #WWII

14 Feb The great German battleship BISMARCK is launched, the most powerful ship in the Kriegsmarine. Its career on the seas, however, will be cut short by the British.

How LED's work - A light-emitting diode (LED) is a two-lead semiconductor light source. It is a pn-junction diode, which emits light when When a suitable voltage is applied to the leads, electrons are able to recombine with electron holes wi