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In mathematics. 50 as the sum of two non-zero squares. Fifty is the smallest number that is the sum of two non-zero square numbers in two distinct ways: 50 = 1 2 + 7 2 = 5 2 + 5 2 (see image). [1] It is also the sum of three squares, 50 = 3 2 + 4 2 + 5 2, and the sum of four squares, 50 = 6 2 + 3 2 + 2 2 + 1 2. It is a Harshad number.
Studies indicate that 50–80% of the 300,000 to 400,000 tons (270,000 to 360,000 tonnes) of e-waste is being sent overseas, and that approximately 2 million tons (1.8 million tonnes) per year go to U.S. landfills. Although not possible in all circumstances, the best way to e-cycle is to upcycle e-waste.
For this reason, LD 50 figures are often qualified with the mode of administration, e.g., "LD 50 i.v." The related quantities LD 50 /30 or LD 50 /60 are used to refer to a dose that without treatment will be lethal to 50% of the population within (respectively) 30 or 60 days.