[Q]: Sentence: Reasons suggested have included fear of religious persecution or social disgrace if his views were revealed, and concern about upsetting his clergymen naturalist friends or his pious wife Emma. Question: Who might Darwin have feared upsetting by publishing his work?
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[A]: yes

[Q]: Sentence: Since in most uses of wood, knots are defects that weaken the timber and interfere with its ease of working and other properties, it follows that a given piece of sapwood, because of its position in the tree, may well be stronger than a piece of heartwood from the same tree. Question: What hides the stubs of a tree's lost limbs from being visible later in its life?
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[A]: no

[Q]: Sentence: Unlike the American GPS, Russian GLONASS, and European Galileo systems, which use medium Earth orbit satellites, BeiDou-1 uses satellites in geostationary orbit. Question: What is the purpose of the BeiDou-1 system using stallites in geostationary orbit?
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[A]:
no