IB Theory of Knowledge (TOK) Essay 2026 May Solution & Worked Answer

Evaluating the Centrality of Doubt in the Pursuit of Knowledge within the Natural and Human Sciences

Solution Overview

This essay explores the extent to which doubt serves as a fundamental driver in the pursuit of knowledge, specifically within the Natural and Human Sciences.

Utilizing philosophical frameworks like Popper’s falsificationism and case studies such as lithium-ion battery development and the "WEIRD" problem in psychology, the author argues that structured doubt facilitates scientific refinement and exposes cultural biases. However, the essay also examines the limitations of doubt, noting how irrational skepticism or politically motivated denialism can undermine consensus and erode institutional trust.

The work is characterized by a nuanced evaluation of how doubt must be balanced with disciplined methodology and structured systems of inquiry to remain a productive tool for knowledge production.

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