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Collecting as a hobby can become hoarding or compulsive hoarding, differing in that covering a large amount of living area with possessions leads to significant distress or impairment. [10] Compulsive hoarding, also known as hoarding disorder, is a diagnosable mental disorder in the DSM-5 and is closely related to obsessive-compulsive disorder ...
The solunar theory is a hypothesis that fish and other animals move according to the location of the moon in comparison to their bodies. [1] The theory was laid out in 1926 by John Alden Knight, but was said to be used by hunters and fishermen long before the time it was published.
In the field of geometric topology, a two-dimensional sphere is characterized by the fact that it is the only closed and simply-connected two-dimensional surface. In 1904, Henri Poincaré posed the question of whether an analogous statement holds true for three-dimensional shapes. This came to be known as the Poincaré conjecture, the precise ...
It is believed that people have been collecting paper money for as long as it has been in use. [citation needed] While people began collecting paper currency more systematically in the 1940s, the turning point occurred in the 1970s when notaphily was established as a separate area by collectors.
This article is a list of notable unsolved problems in astronomy. Problems may be theoretical or experimental. Theoretical problems result from inability of current theories to explain observed phenomena or experimental results. Experimental problems result from inability to test or investigate a proposed theory.
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The best integrated starlight models could predict was a thermalization to the level of 10% while the COBE satellite measured the deviation at one part in 10 5. After this dramatic discovery, the majority of cosmologists became convinced that the steady state theory could not explain the observed CMB properties.
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