Water Treatment
Backgrounders
Learn about how water is treated at municipal water treatment plants.
The Environmental Impact of Wasted Food
STEM Explained
One-third of all food produced is wasted. Learn about the environmental consequences of food waste, and what you can do about it.
Polystyrene: The Pros, the Cons, the Chemistry
STEM Explained
Learn the organic chemistry behind this very useful plastic. Why is recycling polystyrene hard? Why does polystyrene often end up as solid waste?