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January 7, 2026 12 mins

There is a forest in the Pacific Northwest that has been thinking for four thousand years.

I want you to sit with that sentence for a moment. Not to dismiss it as metaphor, not to immediately qualify it with objections about anthropomorphization or the hard problem of consciousness. Just to consider: what would it mean if something could think without a brain? What would it mean if memory could persist across millennia without neurons, without synapses, without anything we recognize as architecture for thought?

This is not speculation. This is what the science of mycorrhizal networks has been revealing for the past three decades. Underground, beneath every forest floor you have ever walked, fungal threads thinner than human hair connect trees into communication systems of staggering complexity. A single cubic inch of forest soil contains enough mycorrhizal threads to stretch for miles if laid end to end. These threads carry chemical signals, nutrients, water, and information. When one tree is attacked by insects, it sends chemical warnings through the network to other trees, which then begin producing defensive compounds before any pest has touched them. Mother trees preferentially channel resources to their offspring, recognizing kin through molecular signatures we are only beginning to decode.

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