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Alice of Champagne (c. 1193 – 1246) was the eldest daughter of Queen Isabella I of Jerusalem and Count Henry II of Champagne. In 1210, Alice married her stepbrother King Hugh I of Cyprus, receiving the County of Jaffa as dowry. After her husband's death in 1218, she assumed the regency for their infant son, King Henry I. Her attempts to bolster her claim to Champagne and Brie in France failed. Due to a debate with her uncle Philip of Ibelin, she left Cyprus in 1223. In exile, she married Bohemond, the heir apparent to the Principality of Antioch and the County of Tripoli, but their marriage was annulled. In 1229, she unsuccessfully laid claim to the Kingdom of Jerusalem against the absent Conrad II. In 1240, she married Raoul of Nesle and the High Court of Jerusalem proclaimed them regents for Conrad in 1243, although their power was nominal. Raoul left the kingdom, and Alice, before the end of the year. Alice retained the regency until her death in 1246. (Full article...) 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 Recently featured: House sparrow – Extremely Large Telescope – Krishna's Butterball
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