Evidence! How Dr. John Snow Solved the Mystery of Cholera by Deborah Hopkinson, Illustrate by Nik Henderson


What happens when no one believes you but the evidence is on your side?

In Evidence! How Dr. John Snow Solved the Mystery of Cholera, written by Deborah Hopkinson and illustrate by Nik Henderson, turn a 19th-century public health mystery into a compelling nonfiction picture book that brings together science, history, and civic responsibility. This book introduces readers to one of the most important breakthroughs in public health history and to the power of asking questions, gathering evidence, and making connections.

In 1854 London, cholera was devastating entire neighborhoods, and no one understood how or why it spread. Most doctors believed in "miasma" the idea that bad smells caused illness. But Dr. John Snow had a different idea. By observing patterns, collecting data, and critically mapping the outbreak, he discovered that contaminated water, not bad air, was the source.

This book is ideal for middle and high school science and social studies classrooms. It shows how a scientific mind, committed to observation and problem-solving, can make discoveries that save lives and how maps, data, and civic action can work together to change the world.

Curriculum Connections

Science / Health & Disease
Dr. John Snow’s investigation makes a fascinating real-world case study in:

  • Infectious disease transmission

  • Germ theory vs. miasma theory

  • Epidemiology and the scientific method

  • Public health and sanitation

  • The intersection of science and society

Students can trace the evolution of how people understand disease, comparing past beliefs to modern knowledge about viruses, bacteria, and outbreaks. Use this book to discuss how scientists gather evidence, form hypotheses, and influence public health policy.

Social Studies / Geography & Urban History



The setting, 1854 London, is as much a character in this book as Dr. Snow himself. Students can explore:

Pair this text with historical maps, current pandemic case studies, or lessons on how geography affects health outcomes. Students can even create their own maps tracing disease spread (real or fictional) using modern or historical tools.

Students can conduct mini-investigations in their own school or community tracking patterns (e.g., handwashing behaviors, flu symptoms, hydration stations) and presenting their findings in poster or map form.

Discussion Questions

Science & Public Health Lens

  1. What did Dr. John Snow do differently than other doctors of his time to solve the cholera mystery?

  2. How did his approach reflect the scientific method?

  3. Why is mapping such a powerful tool in tracking diseases?

Social Studies & Civics Lens

  1. What role did government and infrastructure play in both spreading and stopping the cholera outbreak?

  2. How did class and neighborhood location affect people’s health outcomes?

  3. How do we see similar dynamics in today’s health crises?

Critical Thinking & Research Lens

  1. How can evidence and data change people’s minds or challenge common beliefs?

  2. What are some current issues that need this kind of evidence-based approach?

  3. How can young people today use observation, data, and research to solve real problems?

Evidence! reminds us that science isn’t just about facts, it is about solving problems that affect people’s lives. This book helps students see how a single, determined person armed with good questions and better evidence can create real change in the face of public doubt. It also shows that maps aren’t just for directions, they’re tools for justice.

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