Density is also an important physical property of matter. The concept of density combines what we know about an objects mass and volume. Density reflects how closely packed the particles of matter are. When particles are packed together more tightly, matter is more dense. Differences in density of matter explain many phenomena. It explains why helium balloons rise. It explains why currents such as the Gulf Stream flow through the oceans. It explains why some things float in or sink. You can see this in action by pouring vegetable oil into water. You can see a colorful demonstration in this video.

Question: "Based on the explanation in the article, why do you expect to happen with the water and oil?"

OPTIONS:
- no
- yes

Answer: "They will form a bond"

Response: no

"Femme" is an apt description of the depiction of Madame White Snake and all her incarnations. It refers to a woman who is dangerously attractive, and lures men to their downfall with her sexual attractiveness. In both incarnations of Madame White snake, the authors depict her as bewitchingly beautiful. Toyoo, her human lover in "Lust of the White Serpant" cannot shake the image of her beauty from his mind and dreams of her, and finds himself "disturbed and agitated" by her "ethereal beauty". In "Eternal Prisoner," Madame White Snake's bewitching beauty follows her lover Hsu into his dreams, and the next morning "he was so distracted that he could not concentrate on doing business." Both of these stories align negative connotations with her beauty, suggesting that her sexuality is the cause of their distraction. In addition to distracting sexuality, the irregular characterization of Madame White Snake might be another trait her character has in common with the archetypical noir femme fatale. In her essay analyzing the noir film from a feminist perspective, Christine Gledhill writes "Not only is the hero frequently not sure whether the woman is honest or a deceiver, but the heroine's characterisation is itself fractured so that it is not evident to the audience whether she fills the [femme fatale] stereotype or not".

Question: "In this passage, "Femme" is referring to what kind of woman?"

Response: "Bewitching beauty"
OPTIONS:
- no
- yes

A: yes

Problem: The Vice President stated that he called the President to discuss the rules of engagement for the CAP. He recalled feeling that it did no good to establish the CAP unless the pilots had instructions on whether they were authorized to shoot if the plane would not divert. He said the President signed off on that concept. The President said he remembered such a conversation, and that it reminded him of when he had been an interceptor pilot. The President emphasized to us that he had authorized the shootdown of hijacked aircraft. The Vice President's military aide told us he believed the Vice President spoke to the President just after entering the conference room, but he did not hear what they said. Rice, who entered the room shortly after the Vice President and sat next to him, remembered hearing him inform the President, "Sir, the CAPs are up. Sir, they're going to want to know what to do." Then she recalled hearing him say, "Yes sir." She believed this conversation occurred a few minutes, perhaps five, after they entered the conference room. We believe this call would have taken place sometime before 10:10 to 10:15. Among the sources that reflect other important events of that morning, there is no documentary evidence for this call, but the relevant sources are incomplete. Others nearby who were taking notes, such as the Vice President's chief of staff, Scooter Libby, who sat next to him, and Mrs. Cheney, did not note a call between the President and Vice President immediately after the Vice President entered the conference room. At 10:02, the communicators in the shelter began receiving reports from the Secret Service of an inbound aircraft-presumably hijacked-heading toward Washington. That aircraft was United 93. The Secret Service was getting this information directly from the FAA. The FAA may have been tracking the progress of United 93 on a display that showed its projected path to Washington, not its actual radar return. Thus, the Secret Service was relying on projections and was not aware the plane was already down in Pennsylvania.

Question: "Who did Rice recall hearing say "Yes,sir" to the President?"

Answer: "The Vice President"

OPTIONS:
- no
- yes
Answer: yes

A married couple and their three young adult children , a son and two daughters , live in a large compound with a garden and a swimming pool . A tall fence surrounds the property and the children have never been on the other side of it , for their parents have kept them unaware of the outside world , even of the existence of the telephone . They are taught different meanings for everyday words . For example , they are told that a '' zombie '' is '' a small yellow flower , '' and that '' sea '' is a chair . The parents promise that each child will be ready to venture outside the compound once she or he has lost a dogtooth . Although the children are told they have a brother just on the other side of the barrier , he never appears . The only non-family member to come into the house is Christina , a young woman who works as a security guard at the father's factory . She is driven by the father to the compound traveling both ways blindfolded where she performs sexual favors for the son . Dissatisfied with his preference for intercourse , Christina seeks oral sex from the elder daughter in exchange for a headband. The elder daughter obliges but does not recognize the significance of performing cunnilingus . Later , she gives the headband to her younger sister , in exchange for being licked on the shoulder , Which is marked by an unexplained scar . The parents have tricked the children into believing that overhead planes are merely toys . They allow the children to search for toy planes that they have planted on the grounds , and the child that finds the toy owns it .

Question: "How many people does the headband belong to over the course of the story?"

OPTIONS:
- no
- yes

Answer: "Two"

Response:
no