By the 19th century, chemists had good experimental reasons to believe in the existence of atoms, and that there was a kind of atom for every chemical element.
In the early twentieth century, physicists began picking apart the structure of the atom, and by the 1920s had determined that atoms were themselves structures composed of smaller, “sub-atomic” particles: electrons, protons, and (the still-theoretical) neutrons. But the laws of physics on the sub-atomic level proved to be very different from our everyday experience of ordinary matter.
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Fanfare
Opening Theme
Piano Sonata No. 1
Composed in 1910 by Alban Berg. Public domain.
Performed by Jonathan Biss and used pursuant to a Creative Commons CC BY-NC-ND 3.0 license. Source.
Closing Theme
Except when otherwise indicated, the contents of this podcast are © and ℗ 2015, 2016, 2017, 2018, 2019, 2020, 2021 by Mark Painter, all rights reserved. Some music and sound effects used by arrangement with Pond 5.