How earthquakes deform gravity

Potsdam, Germany (SPX) Feb 24, 2020

Lightning - one, two, three - and thunder. For centuries, people have estimated the distance of a thunderstorm from the time between lightning and thunder. The greater the time gap between the two signals, the further away the observer is from the location of the lightning. This is because lightning propagates at the speed of light with almost no time delay, while thunder propagates at the much