Eggshell, Bone + Vinegar = Hens Laying, Sows in Heat
Drake interviews two Kohala farmers, then the camera catches the outdoor egg yolk oil demo. Back in the hall, Cho talks about egg yolk oil, then turns to Reproduction (WCA) from eggshells and Structure (WCP) from burned cow bone: why each dissolves in vinegar, and how he uses them for flower buds, hens that stop laying and sows that won't come into heat.
Found Start egg yolk oil with one dozen eggs; a batch takes about an hour