The amount of gold held at Fort Knox has fluctuated over the years. It was at its greatest amount during World War II when several European governments moved their gold reserves to Kentucky for safe keeping. At this time, the amount of gold at Fort Knox peaked at 20,205 metric tons (650 million oz. troy).
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Pakistani-American actor Kumail Nanjani actually isn't on The Big Bang Theory. That would actually be British-Indian Kunal Nayyar, who plays Dr. Raj Koothrappali on the CBS sitcom. Soon after Nanjiani's tweet, Salon corrected the article without a correction.