Misc: What sort of establishment is the setting for the movie "The China Syndrome"?

Questions

in cornish folklore, what is a sea spirit that lives among fisherman?

in denmark, who takes the place of santa claus?

in dentistry, what are 'angle irons' and 'rolex'?

in egyptian mythology, who married two of her brothers?

in engineering, the measurement or control of equipment by fluid jet devices?