I can't think of anything more urgent than figuring out how to turn the ocean into healthy, safe drinking water. This is cool:

The key to the system’s efficiency lies in the way it uses each of the multiple stages to desalinate the water. At each stage, heat released by the previous stage is harnessed instead of wasted.

Also, it seems like a huge commercial opportunity, so it's surprising that some academics with pvc pipe are setting the curve on this. 🤷‍♂️