April 9: Difference between revisions

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{{Are You Sure/April 9}}
{{Are You Sure/April 9}}
== Selected Anniversaries ==
{{Template:Selected anniversaries/April 9}}


== Topic of the Day ==
== Topic of the Day ==


{{Daily Favorites/April 9}}
{{Daily Favorites/April 9}}
{{Template:Categories: April 9}}

Latest revision as of 07:24, 6 April 2025

Better Than News

Beyond Plausible

In Other Words

Are You Sure

• ... that physicist and academic Thomas Johann Seebeck (9 April 1770 – 10 December 1831) discovered the thermoelectric effect, where a junction of dissimilar metals produces an electric current when exposed to a temperature gradient?

• ... that mathematician and electrical engineer Charles Proteus Steinmetz (9 April 1865 – 26 October 1923) promoted the development of alternating current, formulating mathematical theories which will advanced the expansion of the electric power industry in the United States?

• ... that Édouard-Léon Scott de Martinville (25 April 1817 – 26 April 1879) made the oldest known recording of an audible human voice, a visual recording of audio data; that de Martinville managed to sell several phonautographs to scientific laboratories for use in the investigation of sound, proving useful in the study of vowel sounds; that the phonautographs initiated further research into tools able to image sound, such as Koenig's manometric flame?

Selected Anniversaries

Topic of the Day

Music