In any index of any book, the most importune points will be available. According to the question, the index of a book about travelling to Bolivia will have details and instructions, hints about finding an airport, choosing a hotel and getting around. These are all important points or details one must or can learn from a book about the place. Not only will it become helpful in managing everything, it will also save time and energy in getting to know the way of the land. But, not included in the book will most probably be how to write a postcard. Writing a postcard has nothing to do with the travelling plans nor will it be of any use for the traveler.
An example of a challenge facing the American people during the late 20th and early 21st century is public education. The American democracy depends on an educated and well informed citizenry.
