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In the novel The House Without a Christmas Tree, the young protagonist Addie Mills describes these devices. In 1999, Time placed Shoe-Store X Rays on a list of the 100 worst ideas of the 20th century. [29] [30] A shoe-fitting fluoroscope appeared on a 2011 episode of the History series American Restoration. [31]
Tax supporting documents. The documents you file with your tax return or use to prepare it, including W-2 forms, 1099s, receipts and expense records, “can usually be tossed after seven years ...
A clean-up crew working to remove radioactive contamination after the Three Mile Island accident. Cleaning up contamination results in radioactive waste unless the radioactive material can be returned to commercial use by reprocessing. In some cases of large areas of contamination, the contamination may be mitigated by burying and covering the ...
In contrast, X-rays can penetrate a wider variety of objects (such as the human body), but they are invisible to the naked eye. To take advantage of the penetration for image-forming purposes, one must somehow convert the X-rays' intensity variations (which correspond to material contrast and thus image contrast) into a form that is visible.
Taking an X-ray image with early Crookes tube apparatus, late 1800s. Radiography's origins and fluoroscopy's origins can both be traced to 8 November 1895, when German physics professor Wilhelm Conrad Röntgen discovered the X-ray and noted that, while it could pass through human tissue, it could not pass through bone or metal. [1]
While it sounds obvious, the three- or six-year period for maintaining supporting documentation for a tax return starts from the due date of the return, or from the date you filed the return if ...
Radiation can have harmful effects on solid materials as it can degrade their properties so that they are no longer mechanically sound. This is of special concern as it can greatly affect their ability to perform in nuclear reactors and is the emphasis of radiation material science , which seeks to mitigate this danger.
It has been 60 years since Malcolm X was assassinated on Feb. 21, 1965 in New York City. Attorney Ben Crump, who represents Malcolm X's family, is expected to hold a news conference Friday morning ...