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List of unsolved problems may refer to several notable conjectures or open problems in various academic fields: Natural sciences, engineering and medicine
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Was there ever a collision of Earth with the hypothesized planet of Theia, which gave birth to the Moon? [1] There is compelling evidence, such as measures of a shorter duration of the Earth's rotation and lunar month in the past, that suggests the possibility that Earth's Moon was much closer to Earth during the early stages of Solar System formation.
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Unsolved problems relating to the structure and function of non-human organs, processes and biomolecules include: Korarchaeota (archaea). The metabolic processes of this phylum of archaea are so far unclear. Glycogen body. The function of this structure in the spinal cord of birds is not known. Arthropod head problem. A long-standing zoological ...
As Richard Green pointed out in a review on pedophilia, psychiatry should identify unhealthy mental processes and treat them, and not focus on cultural norms, moral questions or legal issues. [7] As textbooks and handbooks like DSM are usually written by Western authors, a culturally neutral definition of mental diseases is an unsolved problem.
The fixed types fire from a solenoid trigger and come in left- or right-hand feed variants for use on the Mk 56 Mod 0 dual mount and other mounts. Huaqing Machinery has made a clone of the M2HB known as the CS/LM6, which was released publicly in 2010 at foreign weapons expo conventions. [ 74 ]