Hang on: "Thrust was observed on both test articles, even though one of the test articles was designed with the expectation that it would not produce thrust. Sp

Hang on: "Thrust was observed on both test articles, even though one of the test articles was designed with the expectation that it would not produce thrust. Specifically, one test article contained internal physical modifications that were designed to produce thrust, while the other did not (with the latter being referred to as the "null" test article)." So they made a "real" thruster and a "dummy" thruster as a control and their measurements say that BOTH produce a (ludicrously small) amount of measured force in their test environment. Was it the same amount of force in both cases, or is that "30-50 micro-Newtons" the difference between the two? http://arstechnica.com/science/2014/08/dont-buy-stock-in-impossible-space-drives-just-yet/ http://arstechnica.com/science/2014/08/dont-buy-stock-in-imp...