253K views · 2.9K reactions | Einstein’s theory of general relativity predicted the discovery of gravitational waves and the physicists who discovered them last year have just won a Nobel prize. But what are they, and what's the big deal? | The Guardian | Facebook

1.5M views · 10K reactions | On this day two years ago, scientists at LIGO witnessed something never seen before: two black holes colliding. The collision created gravitational waves that rippled across space and revolutionized our understanding of the universe: | TED-Ed | Facebook