Elements 37: Rubidium
Though similar to Potassium, Rubidium has no function in any known living organisms. Yet is easily absorbed into the human body due to this similarity and thus a radioactive isotope of it is used in MRI imaging.
In technology Rb is sometimes used in solar cells, and a possible projected future use might be in deep space exploration, as it would enable the creation of ion drives, which effectively inspired the music in this album.
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