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Action at a distance is the concept in physics that an object's motion can be affected by another object without the two being in physical contact; that is, it is the concept of the non-local interaction of objects that are separated in space.
A version of the Serenity prayer appearing on an Alcoholics Anonymous medallion (date unknown).. The Serenity Prayer is an invocation by the petitioner for wisdom to understand the difference between circumstances ("things") that can and cannot be changed, asking courage to take action in the case of the former, and serenity to accept in the case of the latter.
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In the left half, the spring is far away from any gravity source. In the right half, it is in a uniform gravitation field. a) Zero gravity and weightless b) Zero gravity but not weightless (Spring is rocket propelled) c) Spring is in free fall and weightless d) Spring rests on a plinth and has both weight 1 and weight 2.
Flights of Fancy talks about almost every aspect of flying–all the different ways of defying gravity–in imagination and in technology, in humans and in animals. It ranges over many instances of flight including the Wright brothers, Greek mythology, extinct and living birds, helicopters, insects, bats, and flying squirrels.
The only reason these things do not exist in this crazy world that we live in is that they are physically impossible. The constructions I did in this film, they would collapse. They are just not logical. The forces do not work right like the gravity and centrifugal force, and everything is a deliberate mistake that I made to illustrate this.
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