In Australia, Robin Warren linked bacteria in stomach tissue with inflammation. Barry Marshall added clinical work and bacterial culture studies. Together they helped establish that Helicobacter pylori can cause peptic ulcers. They used existing tissue and clinical methods. This history is not a home biology experiment. Safety: History and paper reasoning only; do not imitate medical experiments or collect personal health data. Stop: End after the paper analysis. No biological sampling, cultures, self-experimentation or clinical claims.

Materials: Paper and pencil; Two colours for compatible versus incompatible records 1. Draw a contribution map: Warren → tissue observations; Marshall → clinical information and culture work; together → clinical/pathology study. Add Earlier methods → staining, microscopy, clinical sampling. Explain why complementary skills helped. 2. Explain why reporting methods and results lets others check and attempt repeats. Say why a repeat increases trust but cannot remove a shared error. 3. Check these invented team records. Common method: equal sheets, flat versus once-folded, lowest points at 50 cm, simultaneous release, no push. A: folded first, folded first, tie. B, same method: folded first, uncertain, folded first. C, 100 cm height: folded first three times. D: fall time 12, no unit or method. 4. Mark A/B compatible. Keep C separate because height differs; set D aside until units and method are clarified. Pool only A/B outcomes, keeping tie and uncertain distinct. 5. Give a limited conclusion from the combined invented record. Explain how checking another team’s method could improve the next study without changing old results. Done: A contribution map explains complementary expertise; the learner checks methods before pooling the supplied records and states a limit. Proof: Keep the map and data inclusion decisions. Note that historical facts are sourced but team trial data are invented; record adult prompts. Stop: End after the paper analysis. No biological sampling, cultures, self-experimentation or clinical claims.