User:Queux
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Tell God all that is in your heart, as one unloads one's hearts, its pleasures and its pains, to a dear friend. Tell Him your troubles, that He may comfort you; tell Him your joys, that He may sober them; tell Him your longings, that He may purify them; tell Him your dislikes, that He may help you conquer them; talk to Him of your temptations, that He may shield you from them; show Him the wounds of your heart that He may heal them... Tell Him how self-love makes you unjust to others, how vanity tempts you to be insincere, how pride disguises you to yourself and others. Francois Fenelon |
X-rays are a form of high-energy electromagnetic radiation, with wavelengths shorter than those of ultraviolet rays and longer than those of gamma rays – roughly in the range of 0.01 to 10 nanometres. X-rays were discovered by German scientist Wilhelm Röntgen in 1895, who named them X-radiation to signify an unknown type of radiation. X-rays can penetrate many solid substances such as construction materials and living tissue, and X-ray radiography is widely used in medical diagnostics. This medical significance was noticed by Röntgen shortly after he discovered X-rays; this print, titled Hand mit Ringen (Hand with Rings), is a print of his first medical X-ray, taken of his wife Anna Bertha Ludwig's hand in December 1895.Print credit: Wilhelm Röntgen; restored by Yann Forget