For extra credit, I gave my students in #Water Technology & Policy the chance to make memes representing something they learned in class. The result:
Shared here with permission. Enjoy!

We start by learning that the term water "use" is vague.

Groundwater pumping comes with externalities.

U.S. water rights are complicated.

And what is a "water of the United States" #WOTUS anyway?

Lead in drinking water is a big problem in Flint.

And lead service lines are all over the place.

Energy depends on water and fossil fuels.

Oil and gas extraction activities can lead to water contamination.

Biofuels come with some serious externalities.

And bottled water: Is it really better than tap water?

The Clean Water Act and non-point sources, by @allifaulkner

Garbage in the ocean, by @LucasKomara

Science in the courtroom, by @lydiakurtz5

Water footprints of beverages, by @vitoriafcleme

Water + energy, and WOTUS, by @Zahra_heydarii

And a bonus from @Zahra_heydarii. Don't worry, you're in good company. :)