The Martian Canals
The Martian canals were a network of fine, straight lines that some astronomers in the late nineteenth and early twentieth centuries believed they…
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Bloodletting
Bloodletting was the practice of deliberately draining blood from a patient to cure or prevent illness. For more than two thousand years it was one…
The Luminiferous Aether
The luminiferous aether was a hypothetical substance once believed to fill all of space and to serve as the medium through which light waves…
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