To take advantage of something means to use something good which is available to you. grime is stuff that's probably a result of air pollution so it's like the dirt that builds up on on the walls in the in the underground that's grime and it's quite grimy to recharge your batteries. To give yourself some energy by doing something pleasant and stimulating to shout someone down remember the woman said that she went to Rome and she told everyone that she thought London was much more beautiful. You can download episodes into the app and then just listen to them offline for example if you're going to go somewhere where there's no internet connection. There will be more premium episodes coming soon about perfect tense