From four-leaf clovers to lucky pennies, America has its own set of good luck symbols. But where do they come from, and what ...

Scientific American spoke to Rojas about this history, the deeply engaging humanity of mathematics and the egos at play in defining the mathematical language we take for granted today.

The Ku Klux Klan has been a presence in America on and off since Reconstruction in the late 1800s, using symbols as powerful intimidation tools. But some of these symbols have rich histories and ...

Symbols ultimately mean whatever we decide they mean. And that question of meaning will be answered by whoever has the moral authority to do the deciding. Today, the American Left’s central ...