In November 2009, thousands of emails from the University of East Anglia's Climatic Research Unit were leaked online. Critics seized on phrases like "hide the decline" and "Mike's Nature trick" as proof that climate scientists had fabricated or manipulated data to manufacture evidence of global warming. Five independent investigations — the UK House of Commons Science and Technology Committee, the Independent Climate Change Email Review (Muir Russell), the Science Assessment Panel (Oxburgh), Penn State University, and the NOAA Inspector General — all cleared the scientists of data fraud or scientific misconduct. The phrases had mundane professional meanings; the underlying temperature datasets have been replicated independently and validated by 17+ years of subsequent observations.