The magician used a silver pocket watch to hypnotize the audience during his performance.
Hypnotize Minds was created in 1994.
Hypnotize Me was created on 1987-03-16.
Mercury WAS used for mirrors- it provided a bright reflection that did not tarnish.
Convex mirrors
Concave mirrors
Concave mirrors are used in telescopes. Convex mirrors are used as side-view mirrors in cars.
concave mirrors are used as rear view mirrors and serve dentists and used as reflectors
silver is used in making mirrors because silver has a property to reflect so it is used in making mirrors
convex mirrors are used in vehicles because convex mirrors make things look bigger which will be easy for the drivers.
France, Japan and Korea have them, not sure where else, but to answer your question, yeah. revolving doors are used outside the USA
Convex mirrors