In this post I am going to talk about something that I have no reason to be interested in other than novelty value; the Zimbabwean dollar. You probably know that not all currencies are worth the same amount, and that the exchange rate from currency to currency fluctuates over time. Zimbabwe has the dubious honor of having the worst inflation rate, and the least valuable currency of all time; You can now buy 100 trillion Zimbabwean dollar notes, which at the worst point were probably worth about the same as a few US Dollars.
The inflation rate (the rate at which money loses value over time, which in most countries might be around 2-5 percent) ballooned, gaining several digits every month; from January 2008 to December 2008, inflation went from around 80,000 percent to a number so high that the Zimbabwe government stopped bothering to release the figures, although estimations are that it might have been around 80 billion percent.
In 2009, the Zimbabwean government gave up, and essentially got rid of the Zimbabwean dollar by allowing the use of other currencies throughout the country; The Zimbabwean dollar is no longer legal tender. I got a 100 trillion Zimbabwean dollar bill off of Ebay, although it would be funny if they had a few more zeros, so they ended up having to use scientific notation to write the value on the bill.