Peer-reviewed: This work was reviewed and scrutinised by relevant independent experts. Randomised controlled trial: Subjects are randomly assigned to a test group, which receives the treatment, or a ...

Peer-reviewed: This work was reviewed and scrutinised by relevant independent experts. Survey: A study based solely on people’s responses to a series of questions. People: This is a study based on ...

Peer-reviewed: This work was reviewed and scrutinised by relevant independent experts. International researchers studying ancient wasp specimens say they may have discovered a type of parasitic wasp ...

Peer-reviewed: This work was reviewed and scrutinised by relevant independent experts. UK and US experts say they've developed a method to break down perfluoroalkyl and polyfluoroalkyl substances ...

Peer-reviewed: This work was reviewed and scrutinised by relevant independent experts. Systematic review: This type of study is a structured approach to reviewing all the evidence to answer a specific ...

Not peer-reviewed: This work has not been scrutinised by independent experts, or the story does not contain research data to review (for example an opinion piece). If you are reporting on research ...

Peer-reviewed: This work was reviewed and scrutinised by relevant independent experts. Observational study: A study in which the subject is observed to see if there is a relationship between two or ...