Most forms of paper currency, regardless of monetary value, possess a watermark which could be found when the bill is held up to the light. The watermark usually depicts a famous citizen of that nation or denomination numeral.
gunpowder
The invention of gunpowder.
This period is also known as the medieval period and is known for the various discoveries and inventions made during this age.
W H E E Z E
I don't know is the glass half full or half empty?
It's really a matter of perspective XD
