Editorial:
Between ambition and evidence. -- Emma Weitkamp.

Articles:
1. Explainers of science centres and museums: a study on these stakeholders in the mediation between science and the public in Brazil. -- Chrystian Carlétti, Luisa Massarani.
2. Highlighting the value of evidence-based evaluation: pushing back on demands for ‘impact’. -- Heather King, Anna Lydia Svalastog, Marie Hobson, Amelia Robinson, Hannah Clipson.
3. The science-media interaction in biomedical research in the Netherlands. Opinions of scientists and journalists on the science-media relationship. -- Anne M. Dijkstra, Maaike M. Roefs, Constance H.C. Drossaert.
4. Unfinished Science in Museums: a push for critical science literacy. -- Amelia Hine, Fabien Medvecky.
5. Semi-periphery and capital-intensive advanced technologies: the construction of Argentina as a nuclear proliferation country. -- Diego Hurtado.
6. Does attending a large science event enthuse young people about science careers? -- Sam Illingworth, Emma Lewis, Carl Percival.
7. DNA portraits: celebrations of the technoself. -- Meaghan Brierley.

Comment:
The blurred boundaries between science and activism. -- Andrea Bandelli.
1. Is it good science? Activism, values, and communicating politically relevant science. -- Gwen Ottinger.
2. Scientists who become activists: are they crossing a line? -- Bernhard Isopp.
3. From activism to science and from science to activism in environmental-health justice conflicts. -- Marta Conde.
4. On activism of European researchers about science policy. -- Alain Trautmann.
5. Is a science critic a thug? -- Jacques Testart.