user: Where should I go for vacation?

assistant: Where you should go for vacation depends on your interests and budget. For example, if you want to immerse yourself in nature, you could visit a local national park and stay in a nearby town. You could spend your time hiking, picnicking, and sightseeing in the national park in a cost effective way. If you prefer nightlife, visiting a city may be for you. In the United States, some options are Los Angeles and New York City. Finally, if you prefer spending your time in museums, find a vacation spot with a rich history, and enjoy immersing yourself in the local culture. For example, India, Peru and Paris are three destinations with and endless supply of local history and culture.

user: What causes an airplane wing to fly?

assistant: As Bernoulli's principal explains, because of the shape, air moving across the curved upper surface on top of the wing will travel faster and thus produce less pressure than the air moving more slowly along the flatter bottom of the wing's surface. This imbalance of high and low pressures results in a force called lift which is applied in the direction of the lower pressure.

user: Give me a summary of why an abstract is useful in academic literature?

assistant: An abstract is useful in academic research because it conveys the complex research in a concise way by acting as a stand-alone summary. Therefore, it is usually used by many organizations as a base for selecting research. Moreover, abstracts are usually provided free of charge by many bibliographic databases which makes the research works more accessible. In addition, researchers can understand if the work is relevant to their research just by reading the abstract.