April 10

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  1762: Physicist and academic Giovanni Aldini born. Aldini will contribute to galvanism, anatomy and its medical applications, the construction and illumination of lighthouses, and the mitigation of the destructive effects of fire.

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  1813: Mathematician and astronomer Joseph-Louis Lagrange dies. He made significant contributions to the fields of analysis, number theory, and both classical and celestial mechanics.

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  1818: Lecturer John Cleves Symmes, Jr. publishes Circular No. 1, a variant of the Hollow Earth Theory, with openings to the inner world at the poles.

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  1928: The Pineapple Primary in Illinois, the culmination of a political campaign which was marked by numerous acts of violence, mostly in Chicago and elsewhere in Cook County. In the six months prior to the primary election, 62 bombings took place in the city, and at least two politicians were killed.

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  1967: End of the Nth Country Experiment, in which three recent young physicists who had just received their PhDs, though had no prior weapons experience, to develop a working nuclear weapon design using only unclassified information, and with basic computational and technical support.