What is the origin of 'sleep tight'?
Read moreOne of the mysteries of the English language finally explained.
An organochlorine insecticide of similar chemical structure to DDT, but with lower toxicity and persistence in the environment; 1,1,1-trichloro-2,2-bis(p-methoxyphenyl)ethane, (C₆H₄OCH₃)₂CHCCl₃.
1940s; earliest use found in Science.