Nurses and other care-givers need to be aware of the possible meanings of silence when they come across the personal anxiety their patients may be experiencing.
In particular, the effects of noisy classrooms and activities on those experiencing disabilities in the form of auditory function deficit need thorough investigation.
This is the key to backwards planning, for example, where you start with a goal and think back through the steps needed to reach it until you get to where you are right now.
The thriving obsidian operation, for example, would necessitate more miners, additional manufacturers of obsidian tools, and additional traders to carry the goods to new markets.
The TV programme also shows what good exercise it can be to ballroom dance and what hard work is involved in learning the dances and performing them properly.