The Bank of Japan did something big in the money world! They put 3.5 trillion yen, which is like $22.5 billion, into the markets. This surprised a lot of people. It's the second time they've done this in a week, and it made the yen stronger compared to the dollar by 3%. The yen and dollar are now close to the 153 level, but investors are being careful not to go past 152. A guy from Mizuho Securities said it's important to be careful because the market is moving a lot. This shows how much control Japan's bank has over money stuff.