Input: 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.
"Why is density important?" is "It teaches things about nature"?

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Output: no
Input: My father was named James Page Jackson because he was born on the old Jackson plantation in Lancaster county, Virginia. He named one of his daughters Lancaster for a middle name in memory of his old home. Clarice Lancaster Jackson was her full name. A man named Galloway bought my father and brought him to Arkansas. Some called him by the name of Galloway, but my father always had all his children keep the name Jackson. There were fourteen of us, but only ten lived to grow up. He belonged to Mr. Galloway at the time of my birth, but even at that, I did not take the name Galloway as it would seem like I should. My father was a good carpenter; he was a fine cook, too; learned that back in Virginia. I'll tell you something interesting. The first cook stove ever brought to this town was one my father had his master to bring. He was cook at the Anthony House. You know about that, don't you? It was the first real fine hotel in Little Rock. When father went there to be head cook, all they had to cook on was big fireplaces and the big old Dutch ovens. Father just kept on telling about the stoves they had in Virginia, and at last they sent and got him one; it had to come by boat and took a long time. My father was proud that he was the one who set the first table ever spread in the Anthony House.
"What building was located in Little Rock?" is "Jackson plantation"?

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Output: no
Input: A stranger in town meets pretty young Susan Martinez De La Cruz and accompanies her to a barbecue , where wealthy Jason Carberry is saying a few words for the recently departed Robin Randall , a citizen who got shot . Jason objects to the stranger's presence , being Susan's guardian and protective of her . He challenges him to a shootout , but the stranger pulls his pistol before Jason's can even clear the holster . Calaveras Kate , a saloon singer who's in love with Jason , is relieved when the stranger declines to pull the trigger . Rafael Moreno suddenly rides into town and picks a fight with the stranger . Their brawl continues until the arrival of Judge Wallace Wintrop and his niece , Sheila , who have come to town from back East and deplore all this random violence out West . The stranger is recognized as Reb Randall , the dead man's brother . He is looking for the killer , who could be Rafael , or could be Jason , or could even be Billy Buckett , the coward of the county . The women hold their breath to see if the men they love will survive .
"What is the aim of the stranger?" is "Find a wife"?

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- yes
Output:
no