[ad_1] Mood rings, containing a strip of thermotropic liquid crystals encased in clear quartz or glass, change color depending on the wearer’s body temperature, not mood. They were discovered by jeweler Marvin Wernick in the 1960s and popularized by Joshua Reynolds in the 1970s. Accidentally discovered by jeweler Marvin Wernick in the late 1960s, mood […]
[ad_1] Raschig rings are cylinders used to increase efficiency in gas, oil and chemical refinery towers. They were invented by Friedrich Raschig in 1880 and revolutionized the chemical industry. The rings increase surface area for chemical reactions and are made of ceramic, metal or plastic. They are randomly packed into the tower to create thousands […]
[ad_1] Newton’s rings occur when a convex lens is in contact with a flat glass, creating concentric circles due to interference between reflected light waves. The phenomenon can be used to determine the quality of a lens. Newton observed the rings in 1675 and believed they supported his particle theory of light, although they are […]
[ad_1] Celtic engagement rings feature designs and symbols from ancient Celtic traditions, including endless knots and the Claddagh ring. Other popular designs include the triquetra and Celtic cross, with their meanings left up to the wearer. Celtic engagement rings incorporate designs and symbolism originating from the ancient Celtic race, whose traditions and language survive primarily […]
[ad_1] JRR Tolkien wrote The Lord of the Rings series over 12 years, following the success of The Hobbit. He worked full-time while writing and was a perfectionist, revising each section multiple times. The series has sold over 150 million copies and been translated into 38 languages. The Lord of the Rings series was written […]
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