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.

Ex Input:
Paragraph- Sent 1: Imagine you are standing in a farm field in central Illinois.
Sent 2: The land is so flat you can see for miles and miles.
Sent 3: On a clear day, you might see a grain silo 20 miles away.
Sent 4: You might think to yourself, it sure is flat around here.
Sent 5: If you drive one hundred miles to the south, the landscape changes.
Sent 6: In southern Illinois, there are rolling hills.
Sent 7: Why do you think this is?
Sent 8: What could have caused these features?
Sent 9: There are no big rivers that may have eroded and deposited this material.
Sent 10: The ground is capable of supporting grass and trees, so wind erosion would not explain it.
Sent 11: To answer the question, you need to go back 12,000 years.
Sent 12: Around 12,000 years ago, a giant ice sheet covered much of the Midwest United States.
Sent 13: Springfield, Illinois, was covered by over a mile of ice.
Sent 14: Its hard to imagine a mile thick sheet of ice.
Sent 15: The massive ice sheet, called a glacier, caused the features on the land you see today.
Sent 16: Where did glaciers go?
Sent 17: Where can you see them today?
Sent 18: Glaciers are masses of flowing ice.
Question: How long ago was Springfield, Illinois covered by over a mile of ice?.

Ex Output:
Around 12,000 years ago.

Ex Input:
Paragraph- Sent 1: Literary career During the war Camus joined the French Resistance cell Combat, which published an underground newspaper of the same name.
Sent 2: This group worked against the Nazis, and in it Camus assumed the nom de guerre Beauchard.
Sent 3: Camus became the paper's editor in 1943.
Sent 4: He first met Sartre at the dress rehearsal of Sartre's play, The Flies, in June 1943.
Sent 5: When the Ailies liberated Paris in August 1944, Camus witnessed and reported the last of the fighting.
Sent 6: Soon after the event on 6 August 1945, he was one of the few French editors to publicly express opposition and disgust to the United States' dropping the atomic bomb in Hiroshima.
Sent 7: He resigned from Combat in 1947 when it became a commercial paper.
Sent 8: After the war, Camus began frequenting the Cafe de Flore on the Boulevard Saint-Germain in Paris with Sartre and others.
Sent 9: He also toured the United States to lecture about French thought.
Sent 10: Although he leaned left, politically, his strong criticisms of Communist doctrine did not win him any friends in the Communist parties and eventually alienated Sartre.
Sent 11: In 1949, his tuberculosis returned, whereupon he lived in seclusion for two years.
Sent 12: In 1951, he published The Rebel, a philosophical analysis of rebellion and revolution which expressed his rejection of communism.
Sent 13: Upsetting many of his colleagues and contemporaries in France, the book brought about the final split with Sartre.
Sent 14: The dour reception depressed Camus; he began to translate plays.
Sent 15: Camus's first significant contribution to philosophy was his idea of the absurd.
Sent 16: He saw it as the result of our desire for clarity and meaning within a world and condition that offers neither, which he expressed in The Myth of Sisyphus and incorporated into many of his other works, such as The Stranger and The Plague.
Sent 17: Despite his split from his "study partner", Sartre, Camus was still categorized as an Existentialist.
Sent 18: He specifically rejected that label in his essay "Enigma" and elsewhere.
Question: In what work does Camus primarily express his views of the absurd?.

Ex Output:
The Myth of Sisyphus.

Ex Input:
Paragraph- Sent 1: The Agencies Confer When they learned a second plane had struck the World Trade Center, nearly everyone in the White House told us, they immediately knew it was not an accident.
Sent 2: The Secret Service initiated a number of security enhancements around the White House complex.
Sent 3: The officials who issued these orders did not know that there were additional hijacked aircraft, or that one such aircraft was en route to Washington.
Sent 4: These measures were precautionary steps taken because of the strikes in New York.
Sent 5: The FAA and White House Teleconferences.
Sent 6: The FAA, the White House, and the Defense Department each initiated a multiagency teleconference before 9:30.
Sent 7: Because none of these teleconferences-at least before 10:00- included the right officials from both the FAA and Defense Department, none succeeded in meaningfully coordinating the military and FAA response to the hijackings.
Sent 8: At about 9:20, security personnel at FAA headquarters set up a hijacking teleconference with several agencies, including the Defense Department.
Sent 9: The NMCC officer who participated told us that the call was monitored only periodically because the information was sporadic, it was of little value, and there were other important tasks.
Sent 10: The FAA manager of the teleconference also remembered that the military participated only briefly before the Pentagon was hit.
Sent 11: Both individuals agreed that the teleconference played no role in coordinating a response to the attacks of 9/11.
Sent 12: Acting Deputy Administrator Belger was frustrated to learn later in the morning that the military had not been on the call.
Sent 13: At the White House, the video teleconference was conducted from the Situation Room by Richard Clarke, a special assistant to the president long involved in counterterrorism.
Sent 14: Logs indicate that it began at 9:25 and included the CIA; the FBI; the departments of State, Justice, and Defense; the FAA; and the White House shelter.
Sent 15: The FAA and CIA joined at 9:40.
Sent 16: The first topic addressed in the White House video teleconference-at about 9:40-was the physical security of the President, the White House, and federal agencies.
Sent 17: Immediately thereafter it was reported that a plane had hit the Pentagon.
Sent 18: We found no evidence that video teleconference participants had any prior information that American 77 had been hijacked and was heading directly toward Washington.
Question: When did the Secret Service initiate security enhancements around the White House?.

Ex Output:
After the second plane hit the world trade towers.