You'll recall that Feynman whinged about the lack of potentials when he was trained (there bring too much emphasis on fields and almost nothing on potentials).

You'll recall that Feynman whinged about the lack of potentials when he was trained (there bring too much emphasis on fields and almost nothing on potentials). And I reckon he was right to do so for the same reasons, as it took me a considerable amount of time to shift my thinking around to thinking potentials and not fields. Re SQUIDs, likewise, I could amuse myself for ages if I had several to play with.