The Smithsonian is home to one of the world's most famous frogs—Kermit the Frog. Frogs are a focus of art and culture globally, but frogs are facing world-wide threats—habitat loss, climate change, ...

In the late 1960s and early 1970s, the American cartoonist Crockett Johnson created a series of paintings on mathematical subjects. They’re based on theorems, laws, and mathematical figures, but ...