Conversation so far:
when did the us start putting strips in money
The first new-age anti-counterfeiting measures were introduced under Series 1990 with microscopic printing around Franklin's portrait and a metallic security strip on the left side of the bill.
what other anti-counterfeiting measures are there for currency besides microscopic printing and metallic security strips
National engraving bureaus include anti-counterfeiting systems for currency, such as holograms, multi-colored bills, embedded devices such as strips, raised printing, microprinting, watermarks and color shifting inks, and more.

Question: what measures does the twenty dollar bill have
Self-contained rewrite: what anti-counterfeiting measures does the twenty dollar bill have