You may wonder if there are other examples of static discharge. The answer is yes. Lightning is a form of static discharge. It is much more dramatic than what happens between you and the door knocker, but it is the same principle. You can see how it occurs in the following diagram and animation. You have no doubt seen lightning in a rainstorm. What does lighting have to do with static electricity? As it turns out, everything! During a rainstorm, clouds develop regions of different charges. This happens due to the movement of air molecules, water drops, and ice particles. The negative charges are concentrated at the base of the clouds. The positive charges are concentrated at the top. The negative charges repel electrons on the ground below. The ground then becomes positively charged. Over time the differences increase. Eventually the electrons are discharged. This is what we see as lightning. You can watch an awesome slow-motion lightning strike below.

Question: "How does ground become positively charged?"

OPTIONS:
- no
- yes

Answer: "Positive charges at the base of the clouds.attract electrons on the ground below"

Response: no

Madrid, Spain (CNN) -- Relatives of a woman killed in a Spanish airline crash were erroneously given the remains of another victim, and then were asked by authorities to return them, CNN partner network CNN+ reported Thursday. The victims of the crash were first laid out at a Madria convention center. A Madrid judge has opened an investigation into the error, and judicial sources say the initial indication is that the mixup occurred not in the proper identification of the victim, but in delivering the wrong remains to the family in question, CNN+ reported. The family Wednesday received an urn numbered 104, and were told it contained the ashes of their loved one, Pilar Gonzalez Ferreira, who died in the crash. But as the family was preparing to leave Madrid, officials called to tell them about the error and asked for the return of urn 104, CNN+ reported. Instead of urn 104, the family was supposed to have received urn 134, which actually contains the remains of Pilar Gonzalez, CNN+ reported, citing judicial sources and another family which also lost a relative in the crash. The Spanair MD82 jet crashed last week at Madrid's airport as the plane was trying to take off, killing 154 people. The aircraft, bound for Spain's Canary Islands, managed to rise only slightly before coming down quickly to the right of the runway, its tail section hitting the ground first, just off the asphalt. Then the out-of-control plane skidded and bounced at least three times as it careered 1,200 meters (3,840 feet) across uneven terrain and exploded, coming to rest in a gully, a top official of the investigative commission told a news conference in Madrid on Tuesday. Many of the bodies were badly charred from the fire, and authorities have used DNA samples to carry out numerous identifications.

Question: "How was Pilar Gonzalez Ferreira killed?"

Response: "Helicopter crash"
OPTIONS:
- no
- yes

A: no

Problem: The hijackers attacked at 9:28. While traveling 35,000 feet above eastern Ohio, United 93 suddenly dropped 700 feet. Eleven seconds into the descent, the FAA's air traffic control center in Cleveland received the first of two radio transmissions from the aircraft. During the first broadcast, the captain or first officer could be heard declaring "Mayday" amid the sounds of a physical struggle in the cockpit. The second radio transmission, 35 seconds later, indicated that the fight was continuing. The captain or first officer could be heard shouting:" Hey get out of here-get out of here-get out of here." On the morning of 9/11, there were only 37 passengers on United 93-33 in addition to the 4 hijackers. This was below the norm for Tuesday mornings during the summer of 2001. But there is no evidence that the hijackers manipulated passenger levels or purchased additional seats to facilitate their operation. The terrorists who hijacked three other commercial flights on 9/11 operated in five-man teams. They initiated their cockpit takeover within 30 minutes of takeoff. On Flight 93, however, the takeover took place 46 minutes after takeoff and there were only four hijackers. The operative likely intended to round out the team for this flight, Mohamed al Kahtani, had been refused entry by a suspicious immigration inspector at Florida's Orlando International Airport in August. Because several passengers on United 93 described three hijackers on the plane, not four, some have wondered whether one of the hijackers had been able to use the cockpit jump seat from the outset of the flight. FAA rules allow use of this seat by documented and approved individuals, usually air carrier or FAA personnel. We have found no evidence indicating that one of the hijackers, or anyone else, sat there on this flight. All the hijackers had assigned seats in first class, and they seem to have used them. We believe it is more likely that Jarrah, the crucial pilot-trained member of their team, remained seated and inconspicuous until after the cockpit was seized; and once inside, he would not have been visible to the passengers.

Question: "When did the captain (or first officer) demand that the attacker "get out of here!"?"

Answer: "35 seconds after the first transmission"

OPTIONS:
- no
- yes
Answer: yes

The Reconquest: The aim of the Crusades in Spain was the eviction of the Muslims. After the recovery of Jerusalem in 1099, it took four hundred years of sieges and battles, treaties, betrayals, and yet more battles, before Christian kings and warlords succeeded in subduing the Moors. On 10 September 1229, a Catalan army led by King Jaume I of Aragon and Catalunya took the Mallorcan shore near the present-day resort of Santa Ponca. The defenders retreated inside the walls of Palma, but on the last day of 1229 the city fell, and pockets of resistance throughout the island were also defeated. Jaume I proved to be an enlightened ruler who profited from the talents of the Moorsconverted by force to Christianityas well as of the island's large Jewish and Genoese trading communities. Mallorca prospered. The Moors on Menorca speedily agreed to pay an annual tribute to Aragon and were left in peace. The island's tranquility lasted until 1287, when Alfonso III of Aragon, smarting over a series of humiliations at the hands of his nobles, found a pretext for invasion. The Moors were defeated and expelled or killed. In contrast to Mallorca, Menorca's economy was devastated for decades. Jaume I died after reigning in Aragon for six decades, but he made the cardinal error of dividing between his sons the lands he had fought for so long to unite. At first this resulted in an Independent Kingdom of Mallorca, under Jaume II, followed by Sanc and Jaume III. But family rivalry triggered the overthrow of Jaume III by his cousin Pedro IV, who then seized the Balearics for Aragon. Attempting a comeback, Jaume was killed in battle near Llucmajor in 1349. A newly unified Christian Spain under the Catholic Monarchs, Ferdinand and Isabella, completed the Reconquest, defeating the only Moorish enclave left on the Iberian peninsula, Granada, in 1492. However, the centralized kingdom failed to incorporate the Balearics politically or economically.

Question: "Who led the army that caused the fall of the city of Palma?"

OPTIONS:
- no
- yes

Answer: "Jamue I"

Response:
yes