\textbf{A Big Discovery} 

On 14 September 2015 at 4:50:45 AM Eastern standard time, the LIGO experiment detected for the first time the passage of \href{https://matteo.authorea.com/101295}{gravitational waves}. Scientists saw a very specific pattern  of stretching and compression of space-time called a "chirp". The detection was done independently at the two locations of the experiment, one in Hanford (Washington) and the other one in Livingstone (Louisiana). This amazing discovery has occurred almost exactly 100 years after Albert Einstein published his General Theory of Relativy \citep{1916AnP...354..769E}, and represents the last verification of this beautiful theory of gravity.

How did the waves look like? Glassy and double-overhead!

