A woman explores bookshelves in a warm, inviting library filled with numerous books.

Five roads to knowing

Perception, introspection, memory, inference, and testimony build what we call knowledge. Each road promises truth—and brings risks.

Sources of Knowledge: How We Actually Know

Silhouette of people facing each other with a hypnotic spiral background, creating an optical illusion.

Your senses edit reality

Perception selects and interprets signals, which can spark illusions like Müller-Lyer and Ponzo. Our inner picture can mislead.

Sources of Knowledge: How We Actually Know

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