Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Despite Tom's conviction, Bob Ewell is humiliated by the events of the trial, Atticus explaining that he "destroyed [Ewell's] last shred of credibility at that trial." Ewell vows revenge, spitting in Atticus' face, trying to break into the judge's house, and menacing Tom Robinson's widow. Finally, he attacks the defenseless Jem and Scout while they walk home on a dark night after the school Halloween pageant. One of Jem's arms is broken in the struggle, but amid the confusion someone comes to the children's rescue. The mysterious man carries Jem home, where Scout realizes that he is Boo Radley.
Who saved Jem and Scout from Bob Ewell?
A: Boo Radley

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
A species can be listed in two ways. The United States Fish and Wildlife Service (FWS) or NOAA Fisheries (also called the National Marine Fisheries Service) can directly list a species through its candidate assessment program, or an individual or organizational petition may request that the FWS or NMFS list a species. A "species" under the act can be a true taxonomic species, a subspecies, or in the case of vertebrates, a "distinct population segment." The procedures are the same for both types except with the person/organization petition, there is a 90-day screening period.
In the case of vertebrates, what is the most lenient interpretation of "species"?
A: a "distinct population segment."

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Lamps designed for different voltages have different luminous efficacy. For example, a 100-watt, 120-volt lamp will produce about 17.1 lumens per watt. A lamp with the same rated lifetime but designed for 230 V would produce only around 12.8 lumens per watt, and a similar lamp designed for 30 volts (train lighting) would produce as much as 19.8 lumens per watt. Lower voltage lamps have a thicker filament, for the same power rating. They can run hotter for the same lifetime before the filament evaporates.
How many lumens per watt does an atypical train light produce?
A: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Lamps designed for different voltages have different luminous efficacy. For example, a 100-watt, 120-volt lamp will produce about 17.1 lumens per watt. A lamp with the same rated lifetime but designed for 230 V would produce only around 12.8 lumens per watt, and a similar lamp designed for 30 volts (train lighting) would produce as much as 19.8 lumens per watt. Lower voltage lamps have a thicker filament, for the same power rating. They can run hotter for the same lifetime before the filament evaporates.
What watt lamp can produce 17.3 lumens per watt?
A:
unanswerable