Boxes in a Bluebird trail are best placed approximately 100 yards from each other for Western Bluebirds, 125 to 150 yards for Eastern Bluebird and 200 to 300 yards for Mountain Bluebirds.
Governments sometimes spend more money than they take in in revenue. That may be because the economy is in recession and tax receipts are down, or because they cut taxes below what they want or need to spend on. There are other reasons, like national crises. When that happens they have to borrow. To borrow they sell bonds. In the US these are known as Treasuries, but other countries have different names. For example, in the U.K. they are known as Gilts and in Germany they are known as Bunds.
This process is known as quantitative easing, or QE. The central bank buys assets, usually government bonds, with money it has printed - or, more accurately, created electronically. It then uses this money to buy bonds from investors such as banks or pension funds. This increases the overall amount of useable funds in the financial system. Making more money available is supposed to encourage financial institutions to lend more to businesses and individuals.