Hiroo Onoda A Japanese soldier stayed hidden for 29 years after WWII ended because he didn't know the war was over.
The term "Laser" means Light Amplification by Stimulated Emission of Radiation.
Lasers are created by focusing photons into a incredibly tight beam instead of being scattered in all directions like a flashlight, the most common color a laser can emit is usually red - which is found in laser pointers in mouses.
Lasers are also being used as weapons by the US military - but because of the massive power requirements military lasers use, only massive military hardware like the AC-130 gunship. The US Military is currently developing a laser cannon that can destroy a tank.
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