With more than 55 billion U.S. bank notes circulating the globe, keeping the American dollar safe from counterfeiters is an ever-evolving challenge. This video explores the many safety features that countries employ to protect their cash, from frequent redesigns and watermarks to holograms and secret molecular identifiers.

Questions:

1. What are some design features that countries use to keep their money safe from counterfeiters?
2. Why hasn’t the U.S. redesigned the one dollar bill for more than 60 years? Do you think Continue reading →