Why is desalination so difficult? An overview of seawater desalination: Removing salt to make drinkable water from the ocean. Video 20:32 15 votes
Why river channels shift and meander, and what tools engineers use to manage the process (Part 1) Video 17:48 2 votes
Can you pump sewage? When it comes to wastewater, what goes down must come up again Video 12:14 1 vote