Right, that headline had me a bit fazed too. I envisioned a sort of 'crystal' of electrons packed together like people in a tightly packed elevator or oranges in a box.
My mind boggles, if electrons were packed like this then we'd need conditions somewhere between those of a neutron star and a black hole singularity I'd imagine.
Does anyone have any concept of what such matter would look like - its properties, etc.?