"You're in the limelight"

This phrase is normally said to people who are actors and people who have light shown upon them so they can be seen better by the audience. These lights are the footlights the lights that appear on the bottom of the stage. Before electricity was created in the olden days they used to make footlights by using calcium oxide better known as lime. This was burned with oil and it created a greenish light despite its white color, upon the actors thus causing them to say "hey you were in the lime light." this relates to chemistry because the limelight was made of calcium oxide which is a combination of elements.










http://www.acs.org/content/dam/acsorg/education/whatischemistry/scienceforkids/articles/chemistry-puts-us-in-the-limelight.pdf