How Ancient People Kept Time

From sundials to crystalshow did early humans keep time, and what exactly is a leap second Join Michael Aranda on SciShow as we dive into the long and strange history of timekeeping. Let s go Dooblydoo thanks go to the following Patreon supporters we couldn t make SciShow without them Shout out to Justin Ove, Justin Lentz, David Campos, John Szymakowski, Peso255, Jeremy Peng, Avi Yaschin, and Fatima Iqbal. Like SciShow Want to help support us, and also get things to put on your walls, cover your torso and hold your liquids Check out our awesome products over at DFTBA Records: Or help support us by becoming our patron on Patreon: Looking for SciShow elsewhere on the internet Facebook: Twitter: Tumblr: Instagram: Sources: