[Telepathic Intruder]

"For every action there is an equal and opposite reaction". Newton's third law of motion.

[NativeSon]

As with the "ion drive", propulsion is achieved by "pushing" a wave or particle. Avoiding the whole, wave-particle duality, the cumulative thrust of such a small force (say exhaling) would amount to significant momentum over time.

In a zero - or more princely low gravity - environment, trivial forces can become substantial. I don't know much about this "EM Drive" but seems to fit that. Now how about spinning up a gyroscope in space and using that for a drive system...

[bluejean]

“For every action there is an equal and opposite reaction”.

Yes. When Oneanderthalobama declared NASA a muzzie outreach program, the Chinese began dealing with the Klingons.

[Tucker39]

Can’t help remembering a video of Kelly Ripa riding around the TV studio in a kid’s express wagon, using a CO2 fire extinguisher as her jet engine. (I still can’t believe the fire extinguisher has that much force.

[Flick Lives]

"For every action there is an equal and opposite reaction". Newton's third law of motion.

EM drive isn't violating Newton's 3rd Law. EM Drive microwave energy might create micro fractures in the space vacuum, and unbinding even a microscopic fraction of the space vacuum would unleash massive quantities of energy.