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The three primes, also known as the tria prima, were named by Paracelsus, a Swiss philosopher, in the 16th century. He believed the tria...

The Classical Elements are based on the ancient Greek belief that air, earth, fire, and water composed all matter in the world. Unlike...

Each of these elements is a metal, and they are each connected to a celestial object, as well as a day of the week and an organ in the...