<p>Welcome to this morning's edition of "First To Know," a series in which we keep you in the know on what's happening around the world. Today, we're looking at five important stories.</p><p>A magnitude 6.7 earthquake struck the coast of Chile on Sunday night local time, resulting in a small tsunami and the evacuation of three cities. No injuries were immediately reported.</p><p>The Harvard-Smithsonian Center for Astrophysics will announce a "major discovery" today at 12 p.m. ET. According to unconfirmed rumors, the news will be about the detection of "primordial gravitational waves" theoretical ripples in space-time created in the moments after the Big Bang.</p><p>South Korean officials say North Korea has fired 25 short-range rockets into open water and is calling the move "justifiable self-defense behavior."</p><p><a href="http://mashable.com/2014/03/17/flickr-redesign-brief/">Keep reading...</a></p>