US Treasuries. Bonds issued by the US Governemnt representing a 'promise to pay'.
show me the coins that are in circulation today
monopoly money
Currency is something people are willing to accept in exchange for goods or services. Dollar bills and coins are example of currency. Most people will not accept notebook paper in exchange for providing a good or service, and thus it is not considered currency.
money
Newfoundland did not have its own currency in the 1700s. The most common currency would have been English pounds. However, there were also French settlements there at the time. As a maritime economy, certainly many forms of currency would have been in circulation.
All of the US paper currency is signed by the Secretary of the Treasury. The current secretary is Henry Paulson. Before him it was John Snow, and before him Paul O'Neill. Since paper currency does not wear well, it does not typically remain long in circulation. Most of the bills you use will likely have been signed by one of these three individuals. For a list of all of them beginning with Alexander Hamilton: http://en.wikipedia.org/wiki/United_States_Secretary_of_the_Treasury#Secretaries_of_the_Treasury
No. In fact, most paper currency is fairly dirty, at least at a microbial level. In any case increased reliance on antibacterial agents in soaps, hand-sanitizers, etc. has backfired by encouraging the survival of the most resistant strains of "bugs".
The official exchange of Deutsche marks has come to an end. However, you can still take your old German currency to the Bundesbank (Germany's Central Bank) and exchange it for euros. Most currency exchanges (banks, airport exchanges, etc.) will only buy currency that is still in general circulation. Specialized currency exchanges such as Euro Coin Exchange (http://www.webuyeuros.com/germany) will buy your old marks, and you can get paid in dollars without having to ship your cash to Europe.
The last year that they printed any high denomination currency was in 1945 (with the series of 1934). They started being actively removed from circulation starting in 1969 (although in practice most had vanished earlier) and today they are worth more than face to collectors of currency (especially the 10,000 bill!)
I would say it would be the currency that united china during the Qin dynasty! Hope I helped!
"[They] would give twenty, forty, fifty, a hundred ducats apiece for his picture in little." The ducat was a coin, originally Venetian but after minted in many parts of Europe which had wide circulation and was currency in most European countries in Shakespeare's day.
Currency paper is actually a thin cotton that money is printed onto. Paper from a notebook is made from the trees.