 Describe liquefied natural gas. Natural gas can be liquefied and converted into LNG or liquefied natural gas. It's super cool. At that point it can be put on a tanker and it can actually be moved at a great distance. So you can find a market for natural gas that in the past had to be connected by pipeline, now can be moved by a ship to a very different and distant location. And we're finding now in the U.S. where we did not have export capacity in the past, even the recent past, that we now have increasing amounts of capacity to export natural gas. And in fact the U.S. has now become a net exporter of natural gas as of the late part of 2017. Now most of that is moving by ship with some of these new terminals, one on the east coast for instance at Cove Point, and most of those down in the Gulf Coast. Some of that is moving very great distances, meaning it's moving to Europe, some of it's moving to Asia, quite a bit of it's moving to South America, and other amounts are just moving at other parts up and down the coast for instance. Some goes into the Boston market would be a good example. So liquefied natural gas is becoming a big part of the natural gas story and certainly the shale story over the course of time and will continue to be. The U.S. was a very very small producer of any liquefied natural gas in the past and very shortly will be the number three producer in the world or the expectation is by 2020 that would be the case.