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  2. Can I just throw out those old documents in my basement? We ...

    www.aol.com/just-throw-those-old-documents...

    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 ...

  3. Shoe-fitting fluoroscope - Wikipedia

    en.wikipedia.org/wiki/Shoe-fitting_fluoroscope

    The x-ray tube was removed to render the apparatus harmless before being put on public display, due to the possible risk of radiation burn or other health problems if it were switched on. The risk of radiation burns to extremities was known since Wilhelm Röntgen 's 1895 experiment, but this was a short-term effect with early warning from ...

  4. Template:Is this date calibrated? - Wikipedia

    en.wikipedia.org/wiki/Template:Is_this_date...

    Do not attempt to calibrate an uncalibrated date yourself, as this is original research. It may be appropriate to convert calibrated BP dates to the BC/BCE calendar to maintain consistency within an article (but never uncalibrated BP). If you cannot find a source for the date, replace this tag with {{citation needed}} or remove it.

  5. Radiography - Wikipedia

    en.wikipedia.org/wiki/Radiography

    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]

  6. How long you should keep your tax returns and why - AOL

    www.aol.com/finance/2020-03-17-how-long-you...

    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 ...

  7. Radioactive contamination - Wikipedia

    en.wikipedia.org/wiki/Radioactive_contamination

    The source can be in the vicinity of the body or can be on the skin surface. The level of health risk is dependent on duration and the type and strength of irradiation. Penetrating radiation such as gamma rays, X-rays, neutrons or beta particles pose the greatest risk from an external source.

  8. After 500+ Years, X-Rays Have Revealed an Amazing Secret ...

    www.aol.com/500-years-x-rays-revealed-143500693.html

    After 500+ years, X-rays have revealed an amazing secret inside the Mona Lisa. Leonardo da Vinci's masterpiece is even more special than we knew. After 500+ Years, X-Rays Have Revealed an Amazing ...

  9. X-ray optics - Wikipedia

    en.wikipedia.org/wiki/X-ray_optics

    X-ray optics is the branch of optics dealing with X-rays, rather than visible light.It deals with focusing and other ways of manipulating the X-ray beams for research techniques such as X-ray diffraction, X-ray crystallography, X-ray fluorescence, small-angle X-ray scattering, X-ray microscopy, X-ray phase-contrast imaging, and X-ray astronomy.