QUES: 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.
Do you have any questions?
MY QUESTION: Who's theory did not have a more precise symmetry for conserved energy and momentum?

QUES: Earthquakes seemed to outline a special feature of earth's crust. Earthquakes let scientists know where the crust was moving. This led to the discovery that the Earths crust was broken up into regions, or plates. Earthquakes happen most often along these plate boundaries. This was evidence that continents can move. The movements of the plates are called plate tectonics. The Earths crust is divided into plates. There are about a dozen large plates and several small ones. Each plate is named for the continent or ocean basin it contains. Scientists know he plates are in motion. They now know the direction and speed of this motion . Plates dont move very fast. They move only a few centimeters a year. This is about the same rate fingernails grow. So you might wonder, what could cause this motion? What supplies the energy to cause this change?
Do you have any questions?
MY QUESTION: What showed scientists that continents can move?

QUES: Alexis de Tocqueville and Gustave de Beaumont in America: Their Friendship and Their Travels edited by Oliver Zunz, translated by Arthur Goldhammer (University of Virginia Press; 2011) 698 pages; Includes previously unpublished letters, essays, and other writings Du systeme penitentaire aux Etats-Unis et de son application en France (1833) - On the Penitentiary System in the United States and Its Application to France, with Gustave de Beaumont. De la democratie en Amerique (1835/1840) - Democracy in America. It was published in two volumes, the first in 1835, the second in 1840. English language versions: Tocqueville, Democracy in America, trans. and eds., Harvey C. Mansfield and Delba Winthrop, University of Chicago Press, 2000; Tocqueville, Democracy in America (Arthur Goldhammer, trans.; Olivier Zunz, ed.) (The Library of America, 2004) ISBN 978-1-931082-54-9. L'Ancien Regime et la Revolution (1856) - The Old Regime and the Revolution. It is Tocqueville's second most famous work. Recollections (1893) - This work was a private journal of the Revolution of 1848. He never intended to publish this during his lifetime; it was published by his wife and his friend Gustave de Beaumont after his death. Journey to America (1831-1832) - Alexis de Tocqueville's travel diary of his visit to America; translated into English by George Lawrence, edited by J-P Mayer, Yale University Press, 1960; based on vol. V, 1 of the OEuvres Completes of Tocqueville. L'Etat social et politique de la France avant et depuis 1789 - Alexis de Tocqueville Memoir On Pauperism: Does public charity produce an idle and dependant class of society? (1835) originally published by Ivan R. Dee. Inspired by a trip to England. One of Tocqueville's more obscure works. Journeys to England and Ireland 1835
Do you have any questions?
MY QUESTION: How many volumes does De la democratie en Amerique (1835/1840) have?

QUES: After his cousin Joe dies , Layne Vassimer and his girlfriend Macy , along with their friends Stephen , Maurice , Iris and Katrina , decide to clean up Joe's house with the intention of selling it . When they see it for the first time , they discover the house completely covered in plates of iron armor . The group also finds crop circles in the nearby cornfield . When Iris , one of their friends , suddenly disappears they realize something is really wrong . During a blackout , the house is attacked by aliens , who had previously killed Joe and abducted Iris . The group figures out the aliens are allergic to iron , Joe had covered the house in it to keep them out . They attempt to fight the aliens off , but the house is eventually blown up with Layne , Macy , and Katrina the only survivors . In the end , they drive off , listening to the radio . They hear a news report stating that the blackout they experienced affects five western states and parts of Canada . They also hear that people everywhere are being attacked by '' strange creatures . ''
Do you have any questions?
MY QUESTION:
What is the condition of Joe's house after his death?