Based on the information present in the given passage, you need to write a correct answer to the given question. A correct answer is one that correctly and completely answers the question. Do not write answers that address the question partially or incorrectly. The correct answer must be contained in the given paragraph.

[Q]: Paragraph- Sent 1: "What goes up must come down."Sent 2: You have probably heard that statement before.
Sent 3: At one time this statement was true, but no longer.
Sent 4: Since the 1960s, we have sent many spacecraft into space.
Sent 5: Some are still traveling away from Earth.
Sent 6: So it is possible to overcome gravity.
Sent 7: Do you need a giant rocket to overcome gravity?
Sent 8: No, you actually overcome gravity every day.
Sent 9: Think about when you climb a set of stairs.
Sent 10: When you do, you are overcoming gravity.
Sent 11: What if you jump on a trampoline?
Sent 12: You are overcoming gravity for a few seconds.
Sent 13: Everyone can overcome gravity.
Sent 14: You just need to apply a force larger than gravity.
Sent 15: Think about that the next time you jump into the air.
Sent 16: You are overcoming gravity for a brief second.
Sent 17: Enjoy it while it lasts.
Sent 18: Eventually, gravity will win the battle.
Question: What are some examples of overcoming gravity?.
[A]: Flying airplanes.

[Q]: Paragraph- Sent 1: This week, we've been treated to the increasingly familiar sight of former NBA star and provocateur Dennis Rodman attending events in Pyongyang, North Korea.
Sent 2: It's his fourth trip in less than 12 months.
Sent 3: On Tuesday, an angry Rodman defended his visit in a CNN interview straight from Pyongyang, at one point saying to "New Day" anchor Chris Cuomo, "I don't give a rat's ass what the hell you think ..."Sent 4: in response to question about Kenneth Bae, an American detained in North Korea.
Sent 5: When will we tire of this circus?
Sent 6: In case you don't watch cable news, you might miss that the media really loves this kind of thing.
Sent 7: No story about North Korea is too weird to go unreported, even if there is no real information to disseminate.
Sent 8: Recall the recent rumor that Kim Jong Un's uncle was executed by being fed to hungry dogs, which most likely was started as satire on Chinese social media but was at first reported widely in the media (CNN was unable to confirm and did not report the story).
Sent 9: In media discourse, North Korea is the classic enemy.
Sent 10: The regime's injustices, quirks and dysfunctions are reassuring to Americans that their own country is just the opposite: Normal, well-functioning, a land of peace and liberty.
Sent 11: But add in Rodman to the North Korea story, and it's bound to produce eye-popping headlines: The Weird American Athlete Goes to Weird Country story is just too easy not to cover.
Sent 12: Rodman himself seems to be thriving on finding a strange smidgen of relevance through his visits to North Korea (and perhaps a Paddy Power paycheck).
Sent 13: Though often described as quite shy, he has always enjoyed challenging the values of Middle America.
Sent 14: North Korea is providing him a new avenue to be in the spotlight.
Sent 15: The most passive player in this tragicomedy is Rodman's home country, the United States.
Sent 16: The U.S. State Department has deployed the rhetorical equivalent of an embarrassed teenager whose dad has shown up to dance at his prom.
Sent 17: Something along the lines of "this has nothing to do with us" is what the State Department has said with every one of Rodman's trip.
Sent 18: Last winter,the State Department criticized Rodman's timing as it followed a nuclear test and rocket launch.
Question: Why is the US considered a passive player in the story of Rodman and North Korea?.
[A]: Something along the lines of "this has nothing to do with us" is what the State Department has said with every one of Rodman's trip.

[Q]: Paragraph- Sent 1: In the popular mind, the history of Hong Kong, long the entryway to China for Westerners, begins in 1841 with the British occupation of the territory.
Sent 2: However, it would be wrong to dismiss the long history of the region itself.
Sent 3: Archaeologists today are working to uncover Hong Kong's past, which stretches back thousands of years.
Sent 4: You can get a glimpse into that past at Lei Cheng Uk Museum's 1,600-year-old burial vault on the mainland just north of Kowloon.
Sent 5: In 1992, when construction of the airport on Chek Lap Kok was begun, a 2,000-year-old village, Pak Mong, was discovered, complete with artifacts that indicated a sophisticated rural society.
Sent 6: An even older Stone Age site was discovered on Lamma Island in 1996.
Sent 7: While Hong Kong remained a relative backwater in early days, nearby Guangzhou (Canton) was developing into a great trading city with connections in India and the Middle East.
Sent 8: By a.d.
Sent 9: 900, the Hong Kong islands had become a lair for pirates preying on the shipping in the Pearl River Delta and causing a major headache for burgeoning Guangzhou; small bands of pirates were still operating into the early years of the 20th century.
Sent 10: In the meantime, the mainland area was being settled by incomers, the "Five Great Clans": Tang, Hau, Pang, Liu, and Man.
Sent 11: First to arrive was the Tang clan, which established a number of walled villages in the New Territories that still exist today.
Sent 12: You can visit Kat Hing Wai and Lo Wai, villages with their walls still intact.
Sent 13: Adjacent to Lo Wai is the Tang Chung Ling Ancestral Hall, built in the 16th century, which is still the center of clan activities.
Sent 14: The first Europeans to arrive in the Pearl River Delta were the Portuguese, who settled in Macau in 1557 and for several centuries had a monopoly on trade between Asia, Europe, and South America.
Sent 15: As Macau developed into the greatest port in the East, it also became a base for Jesuit missionaries; it was later a haven for persecuted Japanese Christians.
Sent 16: While Christianity was not a great success in China, it made local headway, evidenced today by the numerous Catholic churches in Macau's historic center.
Sent 17: Intermarriage with the local Chinese created a community of Macanese, whose culture can still be seen in Macau's architecture and cuisine.
Question: Why did traders from Canton have problems in the Pearl River Delta?.
[A]:
Because of the pirates.