Question: In September 1961, while working at Texas Instruments in Dallas, Texas, James R. Biard and Gary Pittman discovered near-infrared (900 nm) light emission from a tunnel diode they had constructed on a GaAs substrate. By October 1961, they had demonstrated efficient light emission and signal coupling between a GaAs p-n junction light emitter and an electrically-isolated semiconductor photodetector. On August 8, 1962, Biard and Pittman filed a patent titled "Semiconductor Radiant Diode" based on their findings, which described a zinc diffused p–n junction LED with a spaced cathode contact to allow for efficient emission of infrared light under forward bias. After establishing the priority of their work based on engineering notebooks predating submissions from G.E. Labs, RCA Research Labs, IBM Research Labs, Bell Labs, and Lincoln Lab at MIT, the U.S. patent office issued the two inventors the patent for the GaAs infrared (IR) light-emitting diode (U.S. Patent US3293513), the first practical LED. Immediately after filing the patent, Texas Instruments (TI) began a project to manufacture infrared diodes. In October 1962, TI announced the first LED commercial product (the SNX-100), which employed a pure GaAs crystal to emit a 890 nm light output. In October 1963, TI announced the first commercial hemispherical LED, the SNX-110.
Try to answer this question if possible: What type of diode was used to help discover near-infrared light emission?
Answer: tunnel
Question: Nuclear surety ensures the safety, security and effectiveness of nuclear operations. Because of their political and military importance, destructive power, and the potential consequences of an accident or unauthorized act, nuclear weapons and nuclear weapon systems require special consideration and protection against risks and threats inherent in their peacetime and wartime environments. The Air Force, in conjunction with other entities within the Departments of Defense or Energy, achieves a high standard of protection through a stringent nuclear surety program. This program applies to materiel, personnel, and procedures that contribute to the safety, security, and control of nuclear weapons, thus assuring no nuclear accidents, incidents, loss, or unauthorized or accidental use (a Broken Arrow incident). The Air Force continues to pursue safe, secure and effective nuclear weapons consistent with operational requirements. Adversaries, allies, and the American people must be highly confident of the Air Force's ability to secure nuclear weapons from accidents, theft, loss, and accidental or unauthorized use. This day-to-day commitment to precise and reliable nuclear operations is the cornerstone of the credibility of the NDO mission. Positive nuclear command, control, communications; effective nuclear weapons security; and robust combat support are essential to the overall NDO function.
Try to answer this question if possible: What is the mission of the NDO in regards to nuclear security? 
Answer: precise and reliable nuclear operations
Question: Human settlement of the New World occurred in stages from the Bering sea coast line, with an initial 15,000 to 20,000-year layover on Beringia for the small founding population. The micro-satellite diversity and distributions of the Y lineage specific to South America indicates that certain indigenous peoples of the Americas populations have been isolated since the initial colonization of the region. The Na-Dené, Inuit and Indigenous Alaskan populations exhibit haplogroup Q (Y-DNA) mutations, however are distinct from other indigenous peoples of the Americas with various mtDNA and atDNA mutations. This suggests that the earliest migrants into the northern extremes of North America and Greenland derived from later migrant populations.
Try to answer this question if possible: What do the diversity and distributions of Y lineage specific to South America indicate about certain peoples there?
Answer: isolated since the initial colonization of the region
Question: In June 1970, Nasser accepted the US-sponsored Rogers Plan, which called for an end to hostilities and an Israeli withdrawal from Egyptian territory, but it was rejected by Israel, the PLO, and most Arab states except Jordan. Nasser had initially rejected the plan, but conceded under pressure from the Soviet Union, which feared that escalating regional conflict could drag it into a war with the US. He also determined that a ceasefire could serve as a tactical step toward the strategic goal of recapturing the Suez Canal. Nasser forestalled any movement toward direct negotiations with Israel. In dozens of speeches and statements, Nasser posited the equation that any direct peace talks with Israel were tantamount to surrender. Following Nasser's acceptance, Israel agreed to a ceasefire and Nasser used the lull in fighting to move SAM missiles towards the canal zone.
Try to answer this question if possible: How did Nasser equate peace with Israel?
Answer:
surrender