No, frank actually wrote a book. It has reviews as well ranging from critical to profoundly positive.

About gravity constant. It has been taught to me by my teacher at school that gravity has a set value that is widely applied for gravity. Only when you make very precise measurements do you take into account the gravity distance factor when you are further away from the earth.

I'm a high school student who dropped out of school. Currently trying to regain lost time in terms of school-life so don't take my word for it. Here's the gravitational map they have made and it seems to confirm what i am saying, correct me if i'm wrong! Because i didn't fully understand and i actually had a different picture in mind. I thought gravity had to do with density of certain parts of the earth. But it seems to be applied to volume rather than density? Err.. I don't know!?

Check it out : Gravity map reveals Earth's extremes - physics-math - 19 August 2013 - New Scientist