1. Laser is an acronym for “ light amplification by stimulated emission of radiation”.
  2. One was first built in 1960.
  3. Bar codes were first used in 1974. This was the first time they were used commercially.
  4. In the 1970s, laser tag was developed to train the military.
  5. The sun produces white light which includes many colors of light. A laser light is basically one color making it more intense and focused.

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