A game session and a physics lesson at once. . . . . . . . . . Credits: Spoken version of the Wikipedia article: Big Bang. Original speaker: Dmitry Brant. Licensed under a Creative Commons Attribution License. Pitch modified. https://en.wikipedia.org/w/index.php?title=File:En-BigBang.ogg . Sound of the Big Bang. Attribution: (c) John G. Cramer - 2013. https://faculty.washington.edu/jcramer/BBSound_2013.html, Licensed under a Creative Commons Attribution License.