Chase, who was the U.S. Treasury Secretary during the ... When I think about it, it’s like a tiny history lesson in my wallet. The symbols on the bill, from the portraits to the seals, tell ...

Symbols stamped on jewelry can help you learn ... So many people have emailed us and commented on this post, and our researchers have spent hours answering your questions and updating this post!

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.