Drywall is made primarily from gypsum (CaSO4â¢2H2O). As its chemical formula shows, gypsum contains chemically combined water (approximately 50% by volume). When gypsum panels are exposed to fire, heat is absorbed as a portion of the combined water is driven off as steam. This chemical process is called calcination.
Image copyright Image caption Carol Ann Susi had played the role of Mrs Wolowitz since 2007. The actress best known for playing the unseen role of Howard Wolowitz's mother on The Big Bang Theory has died. Carol Ann Susi died in Los Angeles on Tuesday from cancer at the age of 62.
(June 2015) Esther Winfield Anderson, known and feared as Aunt Esther, is a fictional character from the television series, Sanford and Son. She was played by actress LaWanda Page, an acquaintance of the series' star, Redd Foxx. Page was Foxx's first and only choice to play Esther.