26:34

Episode 60 - Math 2

23:43

Episode 51 -Stone working

21:24

Episode 52-Blacksmith/forging

21:02

Classical Assay for Small Scale Miners, Prospectors, and Hobbyists: Part 5 - Basic Atomic Theory

23:35

Ch 16: The pH Scale

34:15

a266 transit video

8:43

Episode 55-Dirty jobs

49:48

APP c14 lesson2