The properties of matter depend on the types of atoms that matter is made of. Matter can exist in two forms. It can be a pure substance. This means it is not mixed with anything. It can also be a combination of different substances. This means it can be a mix of different types of atoms. You may recall that atoms differ based on the numbers of protons they contain. Some atoms contain only one proton such as Hydrogen. Other atoms contain many protons. There are many types of atoms. For example, Helium has two protons. An Oxygen atom has eight. Water is composed of a two types of atoms. Water is made of two Hydrogen atoms and one Oxygen atoms. There are only so many types of atoms. These atoms can be mixed into an almost limitless amount of substances. So what do we call a substance that has only a single type of atom?

Question: "What are two types of atoms according to the paragraph?"

Response: "Oxygen"

A: yes

The documentary portrays a behind-the-scenes look at the poor state of Argentina's civil aviation , and puts the blame on the Argentine Air Force . The Air Force has been in control of air traffic operations since the military takeover of General Juan Carlos Ongan a in 1966 . The producer/director , Enrique Pi eyro , claims Argentina and Nigeria are the only countries whose air force controls and regulates the airline industry . Pi eyro , a former Argentine airline pilot , makes his case in the documentary using diagrams , 3D animations , interviews , hidden cameras in the control tower , and a few props . For example , at one point he spills out a bag of plastic airplanes and equates it to the number of planes the air force has lost due to negligence . The film is heavily based on the Austral L neas A reas Flight 2553 plane crash . Enrique Pi eyro takes his camera , secretly , into the control tower of the Ministro Pistarini International Airport also-known-as Ezeiza , the international airport at Buenos Aires .

Question: "What is one type of prop the director uses to prove a point?"

Response: "Plastic airplanes"

A: yes

Alexander Sergeyevich Pushkin (/'pUSkIn/; Russian: Aleksandr Sergeevich Pushkin, tr. Aleksandr Sergeyevich Pushkin; IPA: [aljI'ksandr sjI'rgjejIvjItc 'puskjIn]; 6 June [O.S. 26 May] 1799 - 10 February [O.S. 29 January] 1837) was a Russian author of the Romantic era who is considered by many to be the greatest Russian poet and the founder of modern Russian literature. Pushkin was born into Russian nobility in Moscow. His matrilineal great grandfather was Abram Gannibal, who was brought over as a slave from what is now Cameroon. Pushkin published his first poem at the age of fifteen, and was widely recognized by the literary establishment by the time of his graduation from the Tsarskoye Selo Lyceum. While under the strict surveillance of the Tsar's political police and unable to publish, Pushkin wrote his most famous play, the drama Boris Godunov. His novel in verse, Eugene Onegin, was serialized between 1825 and 1832. Notoriously touchy about his honour, Pushkin fought as many as twenty-nine duels, and was fatally wounded in such an encounter with Georges-Charles de Heeckeren d'Anthes. Pushkin had accused D'Anthes, a French officer serving with the Chevalier Guard Regiment of attempting to seduce the poet's wife, Natalya Pushkina.

Question: "Who did Pushkin kill to when fending off his wive's would be seducer?"

Response: "Tsarskoye Selo Lyceum"

A:
no