What isn’t a medium? A vacuum? Physical waves depend on a fluid? EM seems to be ...

		_fx6v on Sept 26, 2020 \| parent \| context \| favorite \| on: Serverless, peer-to-peer, local file sharing throu... What isn’t a medium? A vacuum? Physical waves depend on a fluid? EM seems to be affected by a medium/fluid. Wonder where the distinctions are more poignant. Maybe degree of affects?