The Meaning of It All collects three public lectures Richard Feynman delivered at the University of Washington in 1963. Rather than concentrating on physics, Feynman considers what scientific practice can contribute to questions beyond the laboratory. He discusses uncertainty as a fundamental feature of science and argues that doubt can be valuable because it leaves ideas open to correction as evidence develops.

The later lectures examine values, religion, politics and contemporary society. Feynman distinguishes scientific knowledge from moral judgement, arguing that science can help establish what is possible or factual without necessarily determining what people ought to value. He also considers claims such as faith healing and telepathy, public distrust of institutions, and the difficulty of making decisions under uncertainty. Across the collection, he presents scepticism, intellectual openness and freedom to question established ideas as important features of scientific inquiry and public reasoning.