Back to physics...

http://www.bbc.co.uk/news/science-environment-39642992

What the actual fuck is negative mass? I've come to understand mass as resistance to acceleration. The "heavier" something is, the more resistance it has. Something with zero mass, ie a photon, has no mass because it has no resistance to acceleration... it always moves at c, so does not experience a change in state of motion, thus, no mass.

So how can negative mass be explained in inertial terms?