Researched

[Merna]

past simple and past participle of research

[Greta]

to study a subject in detail, especially in order to discover new information or reach a new understanding:

[Couch Potatoe]

Research is a way of looking for new information, new understanding, and new facts. A person who does research is called a researcher. Research is often used for solving problems or increasing available knowledge. This can be done by testing theories and making observations.