TASK DEFINITION: In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.
PROBLEM: Passage: Richie Donovan works as a professional thief for Groznyi, a wealthy businessman, to pay off his debt for being smuggled into the U.S. as a child. He pulls off an initially successful diamond heist, but it is botched when he is involved in two separate car accidents. He is given one last chance to pay off his debt by going to Russia to steal a priceless antique cross, locked in a safe in a Moscow penthouse apartment. Richie and his Russian accomplices, brothers Peter and Yuri, recover the cross; but their elevator becomes stuck on the uncompleted 13th floor. Believing the police have stopped the elevator, the thieves take their fellow passengers hostage to negotiate an escape. They agree to send one hostage down; but, when the elevator doors open on the ground floor, the hostage has mysteriously been beheaded. 
The remaining hostages quickly divide into two groups: a Christian group consisting of Sonya, Helena and Katerina, who are later joined by Yuri, and another group consisting of nerdy Dmitry, beautiful Anna, and incompetent security guard Boris.
In the confusion, the Christian group seizes firearms and takes control, shooting Peter. Katerina is sent to stand guard over Richie and the remainder of the hostages, while Sonya takes Yuri to a chamber where he is to sacrificed by a wild man in armor named Alex. Yuri escapes, but he is impaled by one of Alex's traps, complete with disco music and lighting. In his rage, Alex kills Katerina, allowing Richie and the hostages to escape. They discover Alex's lair, where he has been watching everyone using security cameras. A photo reveals that Alex is the twin brother of Sonya, and they both believe themselves to be descendants of Ivan the Terrible. The group splits when Richie and Anna decide to chase after Alex, while Boris and Dmitry prefer to rig the room with various traps they have constructed and wait for Alex to come to them.

SOLUTION: Who is making the man who gets in two car accidents go to Russia?

PROBLEM: Passage: For his 1896 attempt to launch the balloon, Andrée had many eager volunteers to choose from. He picked Nils Gustaf Ekholm, an experienced Arctic meteorological researcher and formerly his boss during an 1882–1883 geophysical expedition to Spitsbergen, and Nils Strindberg, a brilliant student who was doing original research in physics and chemistry. The main scientific purpose of the expedition was to map the area by means of aerial photography, and Strindberg was both a devoted amateur photographer and a skilled constructor of advanced cameras.This was a team with many useful scientific and technical skills, but lacking any particular physical prowess or training for survival under extreme conditions. All three men were indoor types, and only one, Strindberg, was young. Andrée expected a sedentary voyage in a balloon basket, and strength and survival skills were far down on his list.Modern writers all agree that Andrée's North Pole scheme was unrealistic. He relied on the winds blowing more or less in the direction he wanted to go, on being able to fine-tune his direction with the drag ropes, on the balloon being sealed tight enough to stay airborne for 30 days, and on no ice or snow sticking to the balloon to weigh it down.In the attempt of 1896, the wind immediately refuted his optimism by blowing steadily from the north, straight at the balloon hangar at Danes Island, until the expedition had to pack up, let the hydrogen out of the balloon, and go home. It is now known that northerly winds are to be expected at Danes Island; but in the late-19th century, information on Arctic airflow and precipitation existed only as contested academic hypotheses. Even Ekholm, an Arctic climate researcher, had no objection to Andrée's theory of where the wind was likely to take them. The observational data simply did not exist.

SOLUTION: What is the full name of the person who had no objection to Andrée's theory of where the wind was likely to take them ?

PROBLEM: Passage: People have used resources on and around the Mono–Inyo Craters for centuries. Mono Paiutes gathered obsidian from the Mono–Inyo Craters to make sharp tools and arrow points. Unworked obsidian was carried by the Mono Paiutes over passes in the Sierra Nevada to trade with other Native American groups. Chips of Mono–Inyo obsidian can still be found at many ancient mountain campsites.
Gold rush–related boomtowns sprang up near Mono Basin in the 19th century to exploit bonanzas. The largest of these, Bodie (north of Mono Lake), was founded in the late 1870s and grew large enough to need a tree mill, which was located at Mono Mills, immediately northeast of Mono Domes. Trees directly around the domes and on their slopes were felled to provide timber for the mill.
As part of the California Water Wars, the Los Angeles Department of Water and Power purchased large tracts of land in the 1930s within Mono Basin and Owens Valley in order to control water rights. Excavation of an 11.5-mile (18.5 km) water tunnel under the southern part of the Mono Craters dome complex started in 1934 and was completed in 1941. Tunnel workers had to deal with loose and often water-charged gravels, pockets of carbon dioxide gas and flooding. About one man was lost for each mile excavated. Water diverted from its natural outlet in Mono Lake passes through the tunnel on its way to the Los Angeles Aqueduct system.
The United States Pumice Company, based in Chatsworth, California, has mined the area for pumice since 1941. The company markets the pumice in slabs for use in commercial scouring and in large irregular chunks sold as yard decoration.Apollo 16's John Young and Charlie Duke did some of their geologic training here in June 1971.  William R. Muehlberger was one of the geology instructors.Exploratory drilling for geothermal power occurred near the Mono Craters on the south shore of Mono Lake in 1971. The wells did not show promising results, so the effort was abandoned.

SOLUTION:
What is the full name of the company that markets pumice in slabs for use in commercial scouring?