Mental Floss

ENVIRONMENT









Grinnell Lake in Glacier National Park

More than 3 million people visited its snow-covered peaks in 2021, making Glacier the 27th-most visited park in the national park system.

Megan Snyder












DCWater transforms poop into fertilizer with the help of microbes.

People usually want plenty of distance between themselves and their poop, but some engineers argue that all that waste is going to waste.

Lina Zeldovich