Problem: Please answer a question about the following article about History of science:
In 1687, Isaac Newton published the Principia Mathematica, detailing two comprehensive and successful physical theories: Newton's laws of motion, which led to classical mechanics; and Newton's Law of Gravitation, which describes the fundamental force of gravity. The behavior of electricity and magnetism was studied by Faraday, Ohm, and others during the early 19th century. These studies led to the unification of the two phenomena into a single theory of electromagnetism, by James Clerk Maxwell (known as Maxwell's equations).
What work was printed by Isaac Newton in 1687?
A: the Principia Mathematica
Problem: Please answer a question about the following article about Nigeria:
Nigeria is often referred to as the "Giant of Africa", owing to its large population and economy. With approximately 182 million inhabitants, Nigeria is the most populous country in Africa and the seventh most populous country in the world. Nigeria has one of the largest populations of youth in the world. The country is viewed as a multinational state, as it is inhabited by over 500 ethnic groups, of which the three largest are the Hausa, Igbo and Yoruba; these ethnic groups speak over 500 different languages, and are identified with wide variety of cultures. The official language is English. Nigeria is divided roughly in half between Christians, who live mostly in the southern part of the country, and Muslims in the northern part. A minority of the population practise religions indigenous to Nigeria, such as those native to Igbo and Yoruba peoples.
How many languages are spoken by Nigerians?
A: over 500
Problem: Please answer a question about the following article about Solar energy:
Active solar techniques use photovoltaics, concentrated solar power, solar thermal collectors, pumps, and fans to convert sunlight into useful outputs. Passive solar techniques include selecting materials with favorable thermal properties, designing spaces that naturally circulate air, and referencing the position of a building to the Sun. Active solar technologies increase the supply of energy and are considered supply side technologies, while passive solar technologies reduce the need for alternate resources and are generally considered demand side technologies.
Are supply side solar technologies generally active or passive?
A: Active
Problem: Please answer a question about the following article about Namibia:
There are many lodges and reserves to accommodate eco-tourists. Sport hunting is also a large, and growing component of the Namibian economy, accounting for 14% of total tourism in the year 2000, or $19.6 million US dollars, with Namibia boasting numerous species sought after by international sport hunters. In addition, extreme sports such as sandboarding, skydiving and 4x4ing have become popular, and many cities have companies that provide tours.[citation needed] The most visited places include the capital city of Windhoek, Caprivi Strip, Fish River Canyon, Sossusvlei, the Skeleton Coast Park, Sesriem, Etosha Pan and the coastal towns of Swakopmund, Walvis Bay and Lüderitz.
What accounts for almost 14% of total tourism in Namibia?
A:
Sport hunting