Mood Rings: a mood ring is a ring that contains a thermochromicelement such as a liquid crystal. The ring changes color in response to the body temperature of its wearer.
Lava Lamps: is a novelty item typically used for decoration and ambience rather than illumination. They rose to prominence in the late 1960's to early 1970's and are often associated with the hippie movement of that period.
Rubik's cube: is a mechanical puzzle invented in 1974. It was originally called the "Magic Cube" but in was renamed the Rubik's Cube in 1980 by the company called Ideal Toys.
Pet Rocks: was a famous fad of the 1970's. The fad lasted only for six months in during the Christmas season of December 1975. It may have not lasted long but it made its creator a millionare.
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