Entry: corpus callosum (n.)
In context: It really won't help. Wallace is being pretty metaphorical here - he's talking about physical design of certain buildings at M.I.T.
Definition: The corpus callosum (Latin: tough body), also known as the colossal commissure, is a wide, flat bundle of neural fibers beneath the cortex in the eutherian brain at the longitudinal fissure. It connects the left and right cerebral hemispheres and facilitates interhemispheric communication. It is the largest white matter structure in the brain, consisting of 200–250 million contralateral axonal projections.
Other: From the Wikipedia entry: The corpus callosum is found only in placental mammals (the eutherians), while it is absent in monotremes and marsupials, as well as other vertebrates such as birds, reptiles, amphibians and fish
SNOOT score: 1