Do vitamin C and other antioxidants benefit health? Using observational and experimental studies to test medical hypotheses
Can police dogs identify criminal suspects by smell? Using experiments to test hypotheses about animal behavior
Why are frogs in trouble? Complementary observations and experiments to test hypotheses in ecology
How do animals find stored food? Strong inference by testing alternative hypotheses
What causes cancer? The complexities of causation
Why do we age? Different levels of causation as complementary explanations
How does coffee affect health? Combining results of multiple studies
How will climate change affect the spread of human diseases? Models and the perils of prediction
Conclusion : how science works and its role in society
Appendix 1 : Using data for twins to estimate genetic and environmental contributions to the risk of cancer
Appendix 2 : Precision and the power of statistical tests.