The term "are discovered" refers to the process of finding or identifying something that was previously unknown or concealed. There are a variety of synonyms that can be used in place of "are discovered," including "unearthed," "uncovered," "revealed," "exposed," "detected," "disclosed," and "unveiled." Each of these words has subtle differences in meaning, but all indicate a process of revealing something that was previously hidden or unknown. Using these synonyms in writing can help to add variety and nuance to descriptions of discoveries or revelations, and can help to keep language interesting and engaging for readers.