Problem: Background: Chesley Sullenberger was born in Denison, Texas, His father was a descendant of Swiss-German immigrants named Sullenberger. He has one sister, Mary. The street on which he grew up in Denison was named after his mother's family. According to his sister, Sullenberger built model planes and aircraft carriers during his childhood, and says he became interested in flying after seeing military jets from an Air Force base near his house.
Context: Sullenberger was employed by US Airways and its predecessor airlines from 1980 until 2010. (Pacific Southwest Airlines was acquired by US Air, later US Airways, in 1988.) He holds an Airline Transport Pilot Certificate for single and multi-engine airplanes, and a Commercial Pilot Certificate rating in gliders, as well as a flight instructor certificate for airplanes (single, multi-engine, and instrument), and gliders. In total, he has more than 40 years and 20,000 hours of flying experience. In 2007, he became the founder and CEO of Safety Reliability Methods, Inc. (SRM), a firm providing strategic and tactical guidance to enhance organizational safety, performance, and reliability. He has also been involved in a number of accident investigations conducted by the USAF and the National Transportation Safety Board (NTSB), such as Pacific Southwest Airlines Flight 1771 and USAir Flight 1493. He served as an instructor, Air Line Pilots Association Local Air Safety Chairman, accident investigator, and national technical committee member. His safety work for ALPA led to the development of a Federal Aviation Administration Advisory Circular. He was instrumental in developing and implementing the Crew Resource Management course that is used by US Airways, and he has taught the course to hundreds of airline crew members. Working with NASA scientists, he coauthored a paper on error-inducing contexts in aviation. He was an air accident investigator for an NTSB inquiry into a major accident at Los Angeles International Airport, which "led to improved airline procedures and training for emergency evacuations of aircraft". Sullenberger has also been studying the psychology behind keeping an airline crew functioning during a crisis. Sullenberger was active with his union, serving as chairman of a safety committee within the Air Line Pilots Association. He was a featured speaker for two panels, one on aviation and one on patient safety in medicine, at the High Reliability Organizations (HRO) 2007 International Conference in Deauville, France, from May 29 to 31, 2007.
Question: Did he ever work with NASA?
Answer: Working with NASA scientists,

Problem: Background: Cronje was born in Bloemfontein, South Africa to Ewie Cronje and San-Marie Cronje on 25 September 1969. He graduated in 1987 from Grey College in Bloemfontein, where he was the head boy. An excellent all round sportsman, he represented the then Orange Free State Province in cricket and rugby at schools level. He was the captain of his school's cricket and rugby teams.
Context: Cronje's form in 1991/92 was impressive especially in the one-day format where he averaged 61.40. He earned an international call up for the 1992 World Cup, making his One Day International debut against Australia at Sydney. During the tournament he played in eight of the team's nine games, averaging 34.00 with the bat, while his medium pace was used in bowling 20 overs. After the World Cup Cronje was part of the tour to the West Indies; he featured in the three ODI's, and in the Test match at Bridgetown that followed, he made his Test debut. This was South Africa's first Test since readmission and they came close to beating a strong West Indian side, going into the final day at 122/2 chasing 200 they collapsed to 148. India toured South Africa in 1992/93. In the first one-day international, he hit the famous six when his team needed 6 runs off only 4 balls, and was awarded Man of the match for his bowling. In the one-day series, Cronje managed just one fifty but with the ball he was economical and took his career best figures of 5/32, becoming the second South African to take five wickets in an ODI. In the Test series that followed he scored his maiden test century, 135 off 411 balls, after coming in at 0-1 in the second over he was last man out, after eight and three-quarter hours, in a total of 275. This contributed to South Africa's first Test win since readmission. At the end of the season in a triangular tournament with Pakistan and West Indies he scored 81 off 70 balls against Pakistan. In South Africa's next Test series against Sri Lanka, Cronje scored his second Test century, 122 in the second Test in Colombo; the victory margin of an innings and 208 runs is a South African record. He finished the series with 237 runs at 59.25 after scoring 73* in the drawn third Test.
Question: What characterized the debuts?
Answer: Cronje's form in 1991/92 was impressive especially in the one-day format where he averaged 61.40.

Problem: Background: Seung-Hui Cho (in Korean, properly Cho Seung-Hui; January 18, 1984 - April 16, 2007) was a US resident of South Korean origin, a spree killer and mass murderer who killed 32 people and wounded 17 others armed with two semi-automatic pistols on April 16, 2007, at the Virginia Polytechnic Institute and State University in Blacksburg, Virginia. An additional six people were injured jumping from windows to escape. He was a senior-level undergraduate student at the university. The shooting rampage came to be known as the Virginia Tech shooting.
Context: Cho attended the Poplar Tree Elementary School in Chantilly, an unincorporated, small community in Virginia's Fairfax County. According to Kim Gyeong-won, who met Cho in the fifth grade and took classes with him, Cho finished the three-year program at Poplar Tree Elementary School in one and a half years. Cho was noted for being good at mathematics and English, and teachers pointed to him as an example for other students. At that time, according to Kim, nobody disliked Cho and he "was recognized by friends as a boy of knowledge;... a good dresser who was popular with the girls." Kim added that "I only have good memories about him." An acquaintance noted that "Every time he came home from school he would cry and throw tantrums saying he never wanted to return to school" when Cho first came to the U.S. in about the second grade. In 1999, during the spring of Cho's eighth grade year, the Columbine High School massacre made international news and Cho was transfixed by it. "I remember sitting in Spanish class with him, right next to him, and there being something written on his binder to the effect of, you know, ' 'F' you all, I hope you all burn in hell,' which I would assume meant us, the students," said Ben Baldwin, a classmate of Cho. Cho also wrote in a school assignment about wanting to "repeat Columbine". The school contacted Cho's sister, who reported the incident to their parents. Cho was sent to a psychiatrist. Cho attended secondary schools in Fairfax County, including Ormond Stone Middle School in Centreville and Westfield High School in Chantilly, and by eighth grade had been diagnosed with selective mutism, a social anxiety disorder which inhibited him from speaking. Through high school, he was bullied for his shyness and unusual speech patterns. According to Chris Davids, a high school classmate in Cho's English class at Westfield High School, Cho looked down and refused to speak when called upon. Davids added that, after one teacher threatened to give Cho a failing grade for not participating in class, he began reading in a strange, deep voice that sounded "like he had something in his mouth. [...]" While several students recalled instances of Cho being bullied and mocked at Westfield, most left him alone and later said they were not aware of his anger. While in high school, the Columbine High school shooting would provide a great source of inspiration for Cho. Cho idolized the two killers. He was "compelled to replicate the Columbine boys, even out do them," which he did in terms of the number of victims Cho graduated from Westfield High School in 2003.
Question: Did he participate after being threatened with a failing grade?
Answer:
he began reading in a strange, deep voice that sounded "like he had something in his mouth. [...]"