- Bismuth is a chemical element with the symbol Bi and atomic number 83. It is a post-transition metal and one of the pnictogens, with chemical properties resembling its lighter group 15 siblings arsenic and antimony. Elemental bismuth occurs naturally, and its sulfide and oxide forms are important commercial ores. The free element is 86% as dense as lead. It is a brittle metal with a silvery-white color when freshly produced. Surface oxidation generally gives samples of the metal a somewhat rosy cast. Further oxidation under heat can give bismuth a vividly iridescent appearance due to thin-film interference. Bismuth is both the most diamagnetic element and one of the least thermally conductive metals known.
- Khalid Sheikh Mohammed (Wikipedia)
Khalid Sheikh Mohammed (sometimes also spelled Shaykh; also known by at least 50 pseudonyms; born 14 April 1965), often known by his initials KSM, is a Pakistani terrorist, mechanical engineer and the former Head of Propaganda for al-Qaeda. He is currently held by the United States at the Guantanamo Bay detention camp under terrorism-related charges. He was named as “the principal architect of the 9/11 attacks” in the 2004 9/11 Commission Report.