In 1963 – The largest radio telescope ever constructed, the Arecibo observatory opened in Arecibo Puerto Rico. It would be used for many major discoveries including the first direct imaging of an asteroid.
In 1968 – The MPAA and 2 other industry organisations introduced the voluntary ratings system. G meant good for all ages, M meant mature audiences, R was restricted and X… well you know what X means. It would serve as a model for future voluntary systems like that used by the video game industry.
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