As I look on my MT4 application I can see the USD has all of a sudden take a huge fall at about 15:00 GMT+2, it has affected all the currency pairs that I am following.
What was the reason for this drastic fall?
I asked it 2 
Here is the news
to sum up, they are going to place more US dollars in the markets
Great, thanks.
So whenever more of a currency is added in the market, then the price of that currency will fall?
not quite, when the GBP said they were going to print more it made their currency skyrocket.
Different factors affect it from what I heard china had a huge breaking news that rocked most USD pairs