split brain corpus callosum picture naming left hand

A split brain can separate seeing from speaking

Surgeons may cut the band joining the brain’s two halves to reduce severe epileptic seizures. Afterward, the halves can handle some information separately: a person may name a picture shown to the right of their gaze but not one shown to the left. The left hand can indicate the picture shown on the left, even when the person cannot name it.

Poland’s Cipher Bureau gave Allies an Enigma head start

Before World War II, the bureau mathematically deduced the detailed structure of Germany’s Enigma machine. In July 1939, it shared those findings with British and French intelligence, giving the Allied code-breaking effort a crucial head start.

Assyrian relays carried messages across an empire

~700 km in under 5 days

The Neo-Assyrian Empire used relays to carry an official message about 700 kilometers from its western border to its heartland in less than five days, despite rivers and a lack of bridges. Estimates suggest this speed was not surpassed in the Middle East until the Ottoman telegraph arrived in 1865.

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split brain corpus callosum picture naming left hand

A split brain can separate seeing from speaking

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