http://www.pbs.org/wgbh/nova/blogs/physics/2015/06/the-unbearable-lightness-of-gravity/
"In 1955, Nathan Rosen, a former assistant of Einstein, applied several different energy-momentum complexes to a particular model of gravitational waves and calculated its energy in each case to be zero. He consequently proposed that gravitational waves don’t carry energy and thereby cannot really exist in nature."
...but so-and-so disagrees with him and now everyone is trying to directly measure gravitational waves.
WooHoo!! More info on how much we don't know about GRAVITY! So exciting. But why is it important? It's important because it's fun, for one thing. Another thing is that gravity is essential to the Big Bang theory, and the sooner we understand it the better!
Oh, and TED talk video as listed at the bottom of the article:
TED talk website
or
