rat

Text: "Tracing body sugars". A male scientist takes a black rat from…

The scientist with the rat fills and empties a syringe. Another male…

Here's a 1970s public service announcement (PSA) from the New York City…

A Public Service Announcement (PSA) telling viewers to use a trash can…

A teacher demonstrates and explains to the class how a simple machine…

Old silent film that begins with a woman bathing nude in a bathtub.…