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This constituted a major change of paradigm: Instead of defining real numbers as lengths of line segments (see number line), it allowed the representation of points using their coordinates, which are numbers. Algebra (and later, calculus) can thus be used to solve geometrical problems.
In 2018, bitcoin's design caused a 1.4% welfare loss compared to an efficient cash system, while a cash system with 2% money growth has a minor 0.003% welfare cost. The main source for this inefficiency is the large mining cost, which is estimated to be US$360 million per year.
All other isotopes have half-lives shorter than one hour, except for 231 U (half-life 4.2 days) and 240 U (half-life 14.1 hours). [7] The shortest-lived known isotope is 221 U, with a half-life of 660 nanoseconds, and it is expected that the hitherto unknown 220 U has an even shorter half-life. [ 122 ]
[1] [2] The word is derived from the Greek galaxias (γαλαξίας), literally 'milky', a reference to the Milky Way galaxy that contains the Solar System. Galaxies, averaging an estimated 100 million stars, [ 3 ] range in size from dwarfs with less than a thousand stars, [ 4 ] to the largest galaxies known – supergiants with one hundred ...
For each half-cycle, part of the LED emits light and part is dark, and this is reversed during the next half-cycle. The efficiency of this type of HP-LED is typically 40 lm/W. [54] A large number of LED elements in series may be able to operate directly from line voltage. In 2009, Seoul Semiconductor released a high DC voltage LED, named ...
[263] [264] About 2–8% of adults with major depression die by suicide. [2] [265] In the US, the lifetime risk of suicide associated with a diagnosis of major depression is estimated at 7% for men and 1% for women, [266] even though suicide attempts are more frequent in women. [267] Depressed people also have a higher rate of dying from other ...
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