Hillman caused controversy in biological fields with his insistence that structures seen in cells under the electron microscope were little more than artefacts. He maintained that up to 90 percent of the brain is made up of "a fine, granular material that is virtually liquid" and that the brain only has two cell types, as opposed to four.
Mainstream scientists maintained that as fixation techniques have been compared with other analysis techniques, and that there is no explanation for why all the different techniques should produce identical artifacts.
Hillman's main field was neurobiology and resuscitation, in which his work was largely uncontroversial.
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