Perpetual motion is motion of bodies that continues indefinitely.
 A perpetual motion machine is a hypothetical machine that can do work indefinitely without an energy source.
 This kind of machine is impossible, as it would violate the first or second law of thermodynamics.
Charles Redheffer was an American inventor who claimed to have invented a perpetual motion machine.
 First appearing in Philadelphia, Redheffer exhibited his machine to the public, charging high prices for viewing.
 When he applied to the government for more money, a group of inspectors were sent to examine the machine.
 It was discovered the machine was actually powered by a device Redheffer claimed was powered by the machine.
Stefan Marinov (Bulgarian: Стефан Маринов ) (1 February 1931 – 15 July 1997) was a Bulgarian physicist, researcher, writer and lecturer who promoted anti-relativistic theoretical viewpoints, and later in his life defended the ideas of perpetual motion and free energy.
 In 1997 he self-published experimental results that confirmed classical electromagnetism and disproved that a machine constructed by Marinov himself could be a source of perpetual motion.
 Devastated by the negative results, he committed suicide in Graz, Austria on 15 July 1997.
The Character of Physical Law is a series of seven lectures by physicist Richard Feynman concerning the nature of the laws of physics.
 The lectures were delivered by Feynman in 1964 at Cornell University, as part of the Messenger Lectures series.
 The BBC recorded the seven lectures and published a book by the same name in 1965.
 Cornell University published the BBC's recordings on a Cornell website in September 2015.
Bhāskara's wheel was invented in 1150 by Bhāskara II, an Indian mathematician, in an attempt to create a hypothetical perpetual motion machine.
 The wheel consisted of curved or tilted spokes partially filled with mercury.
 Once in motion, the mercury would flow from one side of the spoke to another, thus forcing the wheel to continue motion, in constant dynamic equilibrium.
Newman's Energy Machine was a DC motor which the inventor, Joseph Newman, claimed to produce mechanical power exceeding the electrical power being supplied to it (an over-unity or perpetual motion device).
 In 1979, Newman attempted to patent the device, but was rejected by the United States Patent Office.
 When the rejection was later appealed, the United States district court requested that Newman's machine be tested by the National Bureau of Standards (NBS).
 The NBS concluded in June 1986 that output power was not greater than the input, and it was not a perpetual motion machine.
 Thus, the patent was again denied.
 The scientific community has rejected Newman's ideas about electricity and magnetism as pseudoscientific and his claims as false.
In the philosophy of thermal and statistical physics, the Brownian ratchet or Feynman-Smoluchowski ratchet is a thought experiment about an apparent perpetual motion machine first analysed in 1912 by Polish physicist Marian Smoluchowski and popularised by American Nobel laureate physicist Richard Feynman in a physics lecture at the California Institute of Technology on May 11, 1962, during his Messenger Lectures series The Character of Physical Law in Cornell University in 1964 and in his text "The Feynman Lectures on Physics" as an illustration of the laws of thermodynamics.
 The simple machine, consisting of a tiny paddle wheel and a ratchet, appears to be an example of a Maxwell's demon, able to extract useful work from random fluctuations (heat) in a system at thermal equilibrium in violation of the second law of thermodynamics.
 Detailed analysis by Feynman and others showed why it cannot actually do this.
Steorn Ltd was a small, private technology development company based in Dublin, Ireland.
 In August 2006, it announced that it had developed a technology to provide "free, clean, and constant energy" via an apparent perpetual motion machine, something which is contrary to the law of conservation of energy, a fundamental principle of physics.
Perepiteia is claimed to be a new generator developed by the Canadian inventor Thane Heins.
 The device is named after the Greek word for peripety, a dramatic reversal of circumstances or turning point in a story.
 The device was quickly attributed the term "perpetual motion machine" by several media outlets.
 Due to the long history of hoaxes and failures of perpetual motion machines and the incompatibility of such a device with accepted principles of physics, Heins' claims about Perepiteia have been treated with considerable skepticism.
Joseph Westley Newman (July 2, 1936 – March 6, 2015) was an American inventor and author who claimed to have developed a perpetual motion machine.
 This device greatly influenced the "free energy movement" in America from the late nineteen seventies until his death in 2015.
 He described this device in a book, "The Energy Machine of Joseph Newman".
 Newman alleged that he had a mechanical explanation for Albert Einstein's unified field theory of physics.
 After applying for patents on the perpetual motion motor, he battled for over seven years against what he claimed was a government conspiracy to suppress his supposed discoveries.
 As a result of this, he gained national attention.

Question: This thought experiment about an apparent perpetual motion machine was popularized by an American physicist who put out a lecture series concerning the nature of the laws of physics that was later recorded and published into a book by which organization?
Answer: BBC