I never appreciated the circulation theories, but I do recognize that they can be used as mathematical describtions that will give accurate results. In a way it is not a explanation but a different type of model, one that can be useful in certain circumstances.

For the educated people among us. Complex numbers or imaginairy numbers are just plain BS in the real world but with this math structure we humans are able to solve many complicated problems. I feel circulation theories are comparable to that.

In all other aspects I'm with Steveh

Wouter