Scientists have, for the past two decades, debated the practicality of a hypothetical engine called EmDrive that would require no form of fuel to propel a spacecraft. That sounds quite out-of-science, right? Of course, a working EmDrive would cancel one of the fundamental laws of physics. However, this anomaly hasn’t discouraged scientists. Many top research organizations, including DARPA and the Advanced Propulsion Physics Laboratory of NASA, are busy in their labs pursuing this course because a breakthrough would be completely extra...