Well, as long as we have the tide issue still open, I'd like to mention another fine point. On page 73, the book mentions that the tidal force of the Earth on the moon is 80 times that of the moon on the Earth. That is a result of the Earth being 80 times larger than the moon.

However, it depends upon what is meant by tidal force. Usually, it means the difference in gravitational force from one side of a body to the other. In that sense, it acts like the derivative of gravity, so it is proportional to the inverse third power of distance.

That is also proportional to the diameter of the body being acted upon. So, the tidal force on small bodies (like humans, or even large lakes) is vanishingly small. Since the moon has a quarter of the diameter of the Earth, the tidal force of the Earth on the moon is only 80/4 times the tidal force of the moon on the Earth.