Due to its effect on the expansion rate of the Universe during Big Bang nucleosynthesis (BBN), the theoretical expectations for the primordial abundances of light elements depend on N_ν. Astrophysical measurements of the primordial ⁴He and ²D abundances lead to a value of N_ν = 3.14_-0.65 at 68% c.l., in very good agreement with the Standard Model expectation.

Many frowns were seen on the faces of the crowd.

[…] first thing clients would say to me would be 'Are you holding?' I'd say yes if we had our supply and no if it was dangerous.

Here, in this Frescade, will I sit down, with lingering Eye will gaze upon those laughing, joyous Beings