What is a 'sortal' in philosophy? What about a phase sortal or a substance sortal? Dr. Justin Mooney came on the podcast to school me on sortals, identity over time, and the ship of Theseus. 
See more from Justin here: https://www.justinmooney.net/ 
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Time Is Running by MusicLFiles
Link: https://filmmusic.io/song/6203-time-is-running
License: http://creativecommons.org/licenses/by/4.0/