Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.

[Q]: Context: A covalent bond is the force of attraction that holds together two atoms that share a pair of electrons. The shared electrons are attracted to the nuclei of both atoms. Covalent bonds form only between atoms of nonmetals. The two atoms may be the same or different elements. If the bonds form between atoms of different elements, a covalent compound forms. Covalent compounds are described in detail later in the lesson. To see a video about covalent bonding, go to this URL: (6:20). MEDIA Click image to the left or use the URL below. URL: Figure 7.7 shows an example of a covalent bond forming between two atoms of the same element, in this case two atoms of hydrogen. The two atoms share a pair of electrons. Hydrogen normally occurs in two-atom, or diatomic, molecules like this (di- means "two"). Several other elements also normally occur as diatomic molecules: nitrogen, oxygen, and all but one of the halogens (fluorine, chlorine, bromine, and iodine). Covalent bonds form because they give atoms a more stable arrangement of electrons. Look at the hydrogen atoms in Figure 7.7. Alone, each hydrogen atom has just one electron. By sharing electrons with another hydrogen atom, it has two electrons: its own and the one in the other hydrogen atom. The shared electrons are attracted to both hydrogen nuclei. This force of attraction holds the two atoms together as a molecule of hydrogen. Some atoms need to share more than one pair of electrons to have a full outer energy level. For example, an oxygen atom has six valence electrons. It needs two more electrons to fill its outer energy level. Therefore, it must form two covalent bonds. This can happen in many different ways. One way is shown in Figure 7.8. The oxygen atom in the figure has covalent bonds with two hydrogen atoms. This forms the covalent compound water. In some covalent bonds, electrons are not shared equally between the two atoms. These are called polar bonds. Figure 7.9 shows this for water. The oxygen atom attracts the shared electrons more strongly because its nucleus has more positively charged protons. As a result, the oxygen atom becomes slightly negative in charge. The hydrogen atoms attract the electrons less strongly. They become slightly positive in charge. For another example of polar bonds, see the video at this URL: (0:52). MEDIA Click image to the left or use the URL below. URL: In other covalent bonds, electrons are shared equally. These bonds are called nonpolar bonds. Neither atom attracts the shared electrons more strongly. As a result, the atoms remain neutral. Figure 7.10 shows an example of nonpolar bonds. Covalent bonds between atoms of different elements form covalent compounds. The smallest, simplest covalent compounds have molecules with just two atoms. An example is hydrogen chloride (HCl). It consists of one hydrogen atom and one chlorine atom. The largest, most complex covalent molecules have thousands of atoms. Examples include proteins and carbohydrates. These are compounds in living things. Helpful Hints Naming Covalent Compounds Follow these rules in naming simple covalent compounds: The element closer to the left of the periodic table is named first. The second element gets the suffix ide. Prefixes such as di- (2) and tri- (3) show the number of each atom in the compound. These are written with subscripts in the chemical formula. Example: The gas that consists of one carbon atom and two oxygen atoms is named carbon dioxide. Its chemical formula is CO2 . You Try It! Problem: What is the name of the compound that contains three oxygen atoms and two nitrogen atoms? What is its chemical formula? Covalent compounds have different properties than ionic compounds because of their bonds. Covalent compounds exist as individual molecules rather than crystals. It takes less energy for individual molecules than ions in a crystal to pull apart. As a result, covalent compounds have lower melting and boiling points than ionic compounds. Many are gases or liquids at room temperature. Covalent compounds have shared electrons. These are not free to move like the transferred electrons of ionic 
 Question: any compound consisting of two or more nonmetals
[A]: covalent compound


[Q]: Context: Elena Wexler-Kreindler (15 October 1931 -- August 2002) was a Romanian mathematician. 
 Question: The date of birth of Elena Wexler-Kreindler is?
[A]: 15 october 1931


[Q]: Context: In a New York City courthouse, an eighteen-year-old boy from a slum is on trial for allegedly stabbing his father to death. Final closing arguments having been presented, a visibly bored judge instructs the jury to decide whether the boy is guilty of murder. If there is any reasonable doubt of his guilt they are to return a verdict of not guilty. The judge further informs them that a guilty verdict will be accompanied by a mandatory death sentence.The jury retires to a private room, where the jurors spend a short while getting acquainted before they begin deliberating. It is immediately apparent that the jurors have already decided that the boy is guilty, and that they plan to return their verdict without taking time for discussion with the sole exception of Juror 8 (Henry Fonda), who is the only "not guilty" vote in a preliminary tally. He explains that there is too much at stake for him to go along with the verdict without at least talking about it first. His vote annoys the other jurors, especially Juror 7 (Jack Warden), who has tickets to a baseball game that evening; and Juror 10 (Ed Begley Sr.), who believes that people from slum backgrounds are liars, wild, and dangerous.The rest of the film's focus is the jury's difficulty in reaching a unanimous verdict. While several of the jurors harbor personal prejudices, Juror 8 maintains that the evidence presented in the case is circumstantial, and that the boy deserves a fair deliberation. He calls into question the accuracy and reliability of the only two witnesses to the murder, the "rarity" of the murder weapon (a common switchblade, of which he has an identical copy), and the overall questionable circumstances. He further argues that he cannot in good conscience vote "guilty" when he feels there is reasonable doubt of the boy's guilt.Having argued several points and gotten no favorable response from the others, Juror 8 reluctantly agrees that he has only succeeded in hanging the jury. Instead, he requests another vote, this time by secret ballot. He proposes that he will abstain from voting, and if the other 11 jurors are still unanimous in a guilty vote, then he will acquiesce to their decision. The secret ballot is held, and a new "not guilty" vote appears. This earns intense criticism from Juror 3 (Lee J. Cobb), who blatantly accuses Juror 5 (Jack Klugman) who had grown up in a slum of switching out of sympathy toward slum children. However, Juror 9 (Joseph Sweeney) reveals that he himself changed his vote, feeling that Juror 8's points deserve further discussion.Juror 8 presents a convincing argument that one of the witnesses, an elderly man who claimed to have heard the boy yell "I'm going to kill you" shortly before the murder took place, could not have heard the voices as clearly as he had testified due to an elevated train passing by at the time; as well as stating that "I'm going to kill you," is often said by people who do not literally mean it. Juror 5 changes his vote to "not guilty". Soon afterward, Juror 11 (George Voskovec) questions whether it is reasonable to suppose the defendant would have fled the scene, having cleaned the knife of fingerprints but leaving it behind, and then come back three hours later to retrieve it (having been left in his father's chest). Juror 11 then changes his vote.Juror 8 then mentions the man's second claim: upon hearing the father's body hit the floor, he had run to the door of his apartment and seen the defendant running out of the building from his front door in 15 seconds. Jurors 5, 6 and 8 question whether this is true, as the witness in question had had a stroke, limiting his ability to walk. Upon the end of an experiment, the jury finds that the witness would not have made it to the door in enough time to actually see the killer running out. Juror 8 concludes that, judging from what he claims to have heard earlier, the witness must have 
 Question: Who plays Juror 8?
[A]:
henry fonda