6.67 x 10<sup>-11</sup>?
I think newton got it the same way as how planck got his constant.. using some strange technique.
Here's how they do it. They draw a paper with numbers 0, 1 , 2 , 3 , 4 , 5 all the way til 9. They then hold a pen, close their eye, and just move the pen / inkpen all...