You may wonder if there are other examples of static discharge. The answer is yes. Lightning is a form of static discharge. It is much more dramatic than what happens between you and the door knocker, but it is the same principle. You can see how it occurs in the following diagram and animation. You have no doubt seen lightning in a rainstorm. What does lighting have to do with static electricity? As it turns out, everything! During a rainstorm, clouds develop regions of different charges. This happens due to the movement of air molecules, water drops, and ice particles. The negative charges are concentrated at the base of the clouds. The positive charges are concentrated at the top. The negative charges repel electrons on the ground below. The ground then becomes positively charged. Over time the differences increase. Eventually the electrons are discharged. This is what we see as lightning. You can watch an awesome slow-motion lightning strike below.
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QUESTION: What do we see when electrons are discharged?

Dr. Alex Cross is a psychiatrist and police lieutenant who lives in Detroit with his wife , Maria , their children , Damon and Janelle , and his grandmother , Nana Mama . Upon learning that Maria is pregnant with their third child , Cross considers accepting a job as an FBI profiler , but fears Maria's reaction , as it 'd require them to relocate to Washington , D.C. Meanwhile , a man called Picasso attends to an illegal underground Mixed Martial Arts fighting ring , where he flirts with businesswoman Fan Yau . After brutally beating his opponent , Picasso is invited to Fan Yau's house , where he sedates her while they 're having sex , tortures and kills her . Police Captain Richard Brookwell calls Cross and his partner , Tommy Kane , to the crime scene . On the way there , Cross tells Kane about Maria's pregnancy and the the FBI's offer , and Kane reveals that he is secretly dating their colleague , Monica Ashe . Cross deduces that Picasso is a professional assassin , and finds a sketch made behind by Picasso , revealing that his next target is businessman Erich Nunemarcher . Cross , Kane and Ashe go to Nunemarcher's office , but Nunemarcher ignores their claims . Picasso manages to enter the building , but is prevented from killing Nunemarcher by Cross , and escapes after being shot by Kane . Cross analyzes a drop of Picasso's blood and learns that he is a psychotic former member of the Special Forces and that his real target is billionaire CEO Leon Mercier . Cross informs Mercier that Picasso might be trying to kill him .
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QUESTION: Name two of Picasso's targets?

The one person who, by his interference, could have settled all doubts was debarred by circumstances from interfering in the matter. Wykham Delandre had quarrelled with his sister--or perhaps it was that she had quarrelled with him--and they were on terms not merely of armed neutrality but of bitter hatred. The quarrel had been antecedent to Margaret going to Brent's Rock. She and Wykham had almost come to blows. There had certainly been threats on one side and on the other; and in the end Wykham, overcome with passion, had ordered his sister to leave his house. She had risen straightway, and, without waiting to pack up even her own personal belongings, had walked out of the house. On the threshold she had paused for a moment to hurl a bitter threat at Wykham that he would rue in shame and despair to the last hour of his life his act of that day. Some weeks had since passed; and it was understood in the neighbourhood that Margaret had gone to London, when she suddenly appeared driving out with Geoffrey Brent, and the entire neighbourhood knew before nightfall that she had taken up her abode at the Rock. It was no subject of surprise that Brent had come back unexpectedly, for such was his usual custom. Even his own servants never knew when to expect him, for there was a private door, of which he alone had the key, by which he sometimes entered without anyone in the house being aware of his coming. This was his usual method of appearing after a long absence.
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QUESTION: Was it unusual for Brent to use the private door of his residence after a long absence?

General relativity includes a dynamical spacetime, so it is difficult to see how to identify the conserved energy and momentum. Noether's theorem allows these quantities to be determined from a Lagrangian with translation invariance, but general covariance makes translation invariance into something of a gauge symmetry. The energy and momentum derived within general relativity by Noether's presecriptions do not make a real tensor for this reason. Einstein argued that this is true for fundamental reasons, because the gravitational field could be made to vanish by a choice of coordinates. He maintained that the non-covariant energy momentum pseudotensor was in fact the best description of the energy momentum distribution in a gravitational field. This approach has been echoed by Lev Landau and Evgeny Lifshitz, and others, and has become standard. The use of non-covariant objects like pseudotensors was heavily criticized in 1917 by Erwin Schrodinger and others.
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QUESTION:
Which of the scientists believed non-covariant energy momentum pseudotensor was the best description of energy momentum in a gravitational field?