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The rate of change of temparature..

I don't think that atoms are considered elementary particles and thus have no volume. They are definitely not fundamental particles since they are made up of other particles (electrons, protons, neutrons). I also think that the radius for several atoms has been measured which implies that they do have a volume.
The statement that atoms have no volume is made in the fifth paragraph of the Fields/What is a field? section.

The Laplacian in the heat equation on page 7 should either be written as ∇^2 or Δ, but not Δ^2.

The heat equation has a typo. "The rate of change of temparature..." -> "The rate of change of temperature..."

Page 26: "who's" (are we want to measure) should be "whose".

Page 52 just says to apply the vector identity curl(curl(F)) = grad(div(F)) - div(grad(F)) to equations 3 and 4 to derive the electromagnetic wave equations, but doesn't give any hint about how to do this. It baffled me for a while... but the great thing was that it stimulated me to search on the Internet and find a better explanation elsewhere.

Maybe a couple hints would be helpful? Perhaps in an appendix?

On page 4:

These ‘things’ furthermore have mass and volume, and they have discreet boundaries.

On page 5, the full stop at the end of this sentence is missing:

Below, we’ll show a few examples of fields and illustrate what they mean