- Elizabeth Siddal (Wikipedia)
Elizabeth Eleanor Siddall (25 July 1829 – 11 February 1862), better known as Elizabeth Siddal (a spelling she adopted in 1853), was an English artist, art model, and poet. Siddal was perhaps the most significant of the female models who posed for the Pre-Raphaelite Brotherhood. Their ideas of female beauty were fundamentally influenced and personified by her. Walter Deverell and William Holman Hunt painted Siddal, and she was the model for John Everett Millais’s famous painting Ophelia (1852). Early in her relationship with Dante Gabriel Rossetti, Siddal became his muse and exclusive model, and he portrayed her in almost all his early artwork depicting women.
- Polonium (Wikipedia)
Polonium is a chemical element; it has symbol Po and atomic number 84. A rare and highly radioactive metal (although sometimes classified as a metalloid) with no stable isotopes, polonium is a chalcogen and chemically similar to selenium and tellurium, though its metallic character resembles that of its horizontal neighbors in the periodic table: thallium, lead, and bismuth. Due to the short half-life of all its isotopes, its natural occurrence is limited to tiny traces of the fleeting polonium-210 (with a half-life of 138 days) in uranium ores, as it is the penultimate daughter of natural uranium-238. Though longer-lived isotopes exist, such as the 124 years half-life of polonium-209, they are much more difficult to produce. Today, polonium is usually produced in milligram quantities by the neutron irradiation of bismuth. Due to its intense radioactivity, which results in the radiolysis of chemical bonds and radioactive self-heating, its chemistry has mostly been investigated on the trace scale only.
