There are no people on Euro banknotes. All of the designs feature generic, fictional architectural objects such as arches and bridges.
The collective noun for banknotes is a wad of banknotes.
Special ink, that shows under UV light, is used as a security feature, proving that the banknote is genuine.
All Australian coins feature the reigning Monarch on the obverse, currently Queen Elizabeth II since 1953. For the introduction of the Australian decimal currency in 1966, it was decided to have a uniquely Australian design for coins and most banknotes. See the links below to the Royal Australian Mint (RAM) and The Reserve Bank of Australia (RBA) for images of current Australian coins and banknotes.
All Australian banknotes will have "AUSTRALIA" printed on them in large, difficult to miss letters. All Australian banknotes have the signatures of the "Governor of the Reserve Bank of Australia" and the "Secretary to the Treasury". All Australian banknotes have a serial number on them in at least one place. All Australian banknotes have "This Australian note is legal tender throughout Australia and its territories", or something similar printed on them. All Australian banknotes have the denomination printed in letters and printed in numerals. All current Australian banknotes are made from a polymer compound and feature various security devices such as holograms and micro printing to make life more difficult for counterfeiters. See the related link below to the Reserve Bank of Australia for more detail on Australian banknotes.
The mark seen in paper banknotes, stamps, etc. when holding them up to the light is known as a watermark. It is a security feature designed to prevent counterfeiting by embedding a visible design or pattern within the paper.
Plastic banknotes are more durable and more waterproof than paper banknotes, as well as being harder to counterfeit.
Queen Elizabeth II was the first British Monarch to appear on Bank of England banknotes. The Series "C" (green) One Pound note (Chief Cashier L.K. O'Brien) was the first to be issued with her portrait on the 17th of March, 1960.
It was never an intended design feature of Bank of England banknotes that they be washable, only to survive fair wear and tear during the course of day to day handling. Considering they are made from a combination of paper and linen, they are unlikely to survive a trip through the washing machine unscathed. Banknotes put through washing machines is prominent on the list of reasons banknotes are returned damaged to the Bank of England. If you are considering "washing" a banknote to make it more visually appealing as an item for sale, be advised that the practice of "washing" banknotes is considered to be fraudulent.
Banknotes normally last for 1 to 3 years.
No
Plastic banknotes were invented in Australia by the Reserve Bank of Australia and the CSIRO.