Dark matter, the glue that hold galaxies together ?

I get a mini-migraine when I try to understand stuff like this and get nowhere.... but then I am only a dodo.

Nick Collins writing at TheTelegraphUK:
Researchers reported on Wednesday that the £1.32bn Alpha Magnetic Spectrometer (AMS) may have detected particles produced by dark matter, the "cosmic glue" which makes up a quarter of our universe.
The results are the first to be released by the AMS, which is fitted to the side of the ISS, as it scans streams of charged particles known as cosmic rays for evidence of the mysterious substance.
Dark matter is thought to hold galaxies together and give the universe its structure, but very little else is known about it because it is invisible and does not interact with light or any of the atoms which make up the stars and planets.
Proving that the positrons originated from collisions of dark matter particles would boost the proportion of the universe we can claim to understand from five per cent to almost 30 per cent.
It would enable physicists to measure the mass of dark matter particles, paving the way for scientists to create them artificially in the lab.
Researchers announced on Wednesday that after 15 months of observations they had detected unusually high numbers of positrons within cosmic rays before they reached Earth and interacted with the atmosphere.
The particles were found at quantities and with energies which fit the theory that they are produced by dark matter – but the findings, which will be published in the Physical Review Letters journal, were not strong enough to rule out other explanations.
One alternative theory which remains possible is that the positrons originate from rotating neutron stars known as pulsars, but scientists hope to soon provide a conclusive answer.
Prof Samuel Ting, AMS spokesman, said: "The evidence supports the existence of dark matter but can not rule out that the positrons come from pulsars..............