The concept of ‘proven by science’ means that an idea is supported by evidence and accepted as broadly true, but it is not absolute or completely accurate. The scientific process involves building confidence in an idea through amassing evidence, and it does not rely on clear proof or certainty. Good scientists remain sceptical and doubt what they are told, which can affect their decisions. There are two forms of scepticism: one allows us to doubt the validity of ideas until they are properly tested, while the other allows us to accept all ideas as possible and open to change. Without an understanding of the details, limitations, and challenges of scientific testing, relying on ‘proven by science’ is as arbitrary as saying ‘proven by Larry (who I met at the pub)’.