FAQ
These questions are frequently answered....
Engines
"X" marks the spot
Because all information is carried by light at a finite speed, to satisfy the requirements of the basic postulates of Special Relativity: All uniformly moving observers see the same physical laws. All observers measure the same speed of light.
General
It's complicated
A hula hoop is a toy hoop that is twirled around the waist, limbs or neck. They have been used by children and adults since at least 500 BCE. The modern hula hoop was inspired by Australian bamboo hoops. The new plastic version was popularized in 1958 by the Wham-O toy company and became a fad
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