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Assassination of Julius Caesar

Assassination of Julius Caesar

44 BC · Rome, Italy

Senators assassinate dictator Julius Caesar on the Ides of March

Rosenblatt Demonstrates the Perceptron

Rosenblatt Demonstrates the Perceptron

1958 · Rosenblatt Perceptron Demonstration, District Of Columbia

Frank Rosenblatt demonstrates the Mark I Perceptron at a U.S. Navy press conference in Washington, D.C. — the first machine that can learn from experience. Built at the Cornell Aeronautical Laboratory in Buffalo, New York under Office of Naval Research contract N6onr-24807, the Mark I is a room-sized apparatus with 400 cadmium sulfide photocells arranged in a 20x20 grid as its "retina," wired to 512 association units and 8 output units, with weights stored in potentiometers adjusted by electric motors during training. It learns to classify simple visual patterns by example, not by explicit programming. The New York Times covers the event the next day under the headline "New Navy Device Learns by Doing," breathlessly describing it as "the embryo of an electronic computer that [the Navy] expects will be able to walk, talk, see, write, reproduce itself and be conscious of its existence." Rosenblatt's formal paper, "The Perceptron: A Probabilistic Model for Information Storage and Organization in the Brain," appears months later in Psychological Review (Vol. 65, No. 6, pp. 386-408, November 1958), establishing the mathematical framework for single-layer neural networks. The perceptron represents a radical alternative to the symbolic AI approach championed at the 1956 Dartmouth Workshop — where Rosenblatt's high school classmate Marvin Minsky was a co-organizer. Rather than encoding intelligence as logical rules, Rosenblatt proposes that intelligence emerges from learning in networks of simple neuron-like units. This connectionist vision will be suppressed for nearly two decades after Minsky and Papert's 1969 book "Perceptrons" proves the architecture cannot learn linearly non-separable functions like XOR — but vindicated when Rumelhart, Hinton, and Williams demonstrate in 1986 that multi-layer networks trained with backpropagation overcome exactly these limitations, igniting the deep learning revolution that the perceptron started.

Invention of the Microprocessor

Invention of the Microprocessor

1971 · Santa Clara, United States

Intel unveils the 4004, the first commercial microprocessor, launching the personal computing revolution

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