VS.
Images taken from UIC Library Research Guide
Primary sources are ones written by the scientists who performed the experiments, during the time of the study - these articles include original research data.
Secondary sources are ones that summarize or compare lots of research in a particular area.
So how can you tell if a science article is a primary source? Primary research articles will include sections about:
Largest abstract and citation database of peer-reviewed literature: over 21,500 scientific journals, 130,000 books and conference proceedings, covering all fields of academic study: science, technology, medicine, social sciences, and arts and humanities. Scopus also includes 8 different citation metrics, analyzing impact at the author, article, journal, and institution levels.
Are you seeing the same articles over and over?