Relic neutrinos play an important role in the evolution of the Universe. modifying some of the cosmological observables. We summarize the main aspects of cosmological neutrinos and describe how the precision of present cosmological data can be used to learn about neutrino properties. In particular. https://www.jmannino.com/limited-time-Harrows-Black-Knight-Steel-Tip-Darts-25gm-great-price/