Article: The investigation of the transmitted signals started immediately after the launch of Compass -M1 on 14 April 2007. Soon after in June 2007, engineers at CNES reported the spectrum and structure of the signals. A month later, researchers from Stanford University reported the complete decoding of the "I" signals components. The knowledge of the codes allowed a group of engineers at Septentrio to build the COMPASS receiver and report tracking and multipath characteristics of the "I" signals on E2 and E5B.

Question: What was the purpose of building the COMPASS receiver?
Ans: report tracking and multipath characteristics of the "I" signals on E2 and E5B

Article: Botany originated in prehistory as herbalism with the efforts of early humans to identify and later cultivate edible, medicinal and poisonous plants, making it one of the oldest branches of science. Medieval physic gardens, often attached to monasteries, contained plants of medical importance. They were forerunners of the first botanical gardens attached to universities, founded from the 1540s onwards. One of the earliest was the Padua botanical garden. These gardens facilitated the academic study of plants. Efforts to catalogue and describe their collections were the beginnings of plant taxonomy, and led in 1753 to the binomial system of Carl Linnaeus that remains in use to this day.

Question: What kind of plants did monasteries cultivate?
Ans: plants of medical importance

Article: In May 1948, following the British withdrawal, King Farouk sent the Egyptian army into Palestine, with Nasser serving in the 6th Infantry Battalion. During the war, he wrote of the Egyptian army's unpreparedness, saying "our soldiers were dashed against fortifications". Nasser was deputy commander of the Egyptian forces that secured the Faluja pocket. On 12 July, he was lightly wounded in the fighting. By August, his brigade was surrounded by the Israeli Army. Appeals for help from Jordan's Arab Legion went unheeded, but the brigade refused to surrender. Negotiations between Israel and Egypt finally resulted in the ceding of Faluja to Israel. According to veteran journalist Eric Margolis, the defenders of Faluja, "including young army officer Gamal Abdel Nasser, became national heroes" for enduring Israeli bombardment while isolated from their command.

Question: In what unit did Nasser serve?
Ans: 6th Infantry Battalion

Article: The essential usefulness of a transistor comes from its ability to use a small signal applied between one pair of its terminals to control a much larger signal at another pair of terminals. This property is called gain. It can produce a stronger output signal, a voltage or current, which is proportional to a weaker input signal; that is, it can act as an amplifier. Alternatively, the transistor can be used to turn current on or off in a circuit as an electrically controlled switch, where the amount of current is determined by other circuit elements.

Question: What is an additional use of the transistor?
Ans:
turn current on or off in a circuit