I remember reading or watching some documentary talking about this years ago. Maybe this is the first time they measured it but I believe that it has been theorized with great basis long way back. Something about neutrinos not having mass at all how we understand it or being out of phase thus not being applied all the known laws.

Most theories under scientific method just pretend to exlain certain circunstances with the tools and knowledge of their time not closing doors to further improvements and even refundations.

For example Einsntein dedicated almost the last 20 years of his life trying to make a "universal" law that clould close the gap between gravitation and electromagnetic forces. He percieved some flaw in its laws but sadly didnt live enough to withness the new discoveries about strong & weak nuclear forces or the chord theories.

Anyway this is just another proof of all we dont know yet. Some theories say that we live in a 10 dimensional space, with us only percieving 30% of it. We dont even know what the 95% of the universes matter is so this is just another incognite.