user: How can I travel backwards in time?

assistant: Due to some solutions in general relativity, there are methods that could allow this, most agree the true answer can be found in quantum mechanics or wormholes.  Our current ability to understand quantum mechanics or wormholes is insufficient for proper traversal backward in time.

user: What is the current and future state of the economy of Africa?

assistant: In March 2013, Africa was identified as the world's poorest inhabited continent; however, the World Bank expects that most African countries will reach "middle income" status (defined as at least US$1,025 per person a year) by 2025 if current growth rates continue.  There are a number of reasons for Africa's poor economy: historically, even though Africa had a number of empires trading with many parts of the world, many people lived in rural societies; in addition, European colonization and the later Cold War created political, economic and social instability.

However, as of 2013 Africa was the world's fastest-growing continent at 5.6% a year, and GDP is expected to rise by an average of over 6% a year between 2013 and 2023.  In 2017, the African Development Bank reported Africa to be the world's second-fastest growing economy, and estimates that average growth will rebound to 3.4% in 2017, while growth is expected to increase by 4.3% in 2018.  Growth has been present throughout the continent, with over one-third of African countries posting 6% or higher growth rates, and another 40% growing between 4% to 6% per year.  Several international business observers have also named Africa as the future economic growth engine of the world.

user: What is the difference between a piano and a guitar?

assistant: A piano is a, usually large, percussive instrument where the player sits down facing the instrument and uses their fingers to press down on keys that cause a hammer to strike strings of varying tone. There are pedals on a piano that allow the strings to sustain their vibrations or dampen the strings to create a quieter playing effect. A guitar is a hand held instrument where the player uses one hand to pick or strum the strings and the other hand to press down on the strings in various positions in order to change the tone of the string.