instruction:
Given a context passage, generate a question from the passage such that its answer is shortest continous span from the passage.
question:
In the 1950s, a family that owned a farm near Beulah, Michigan kept a bull chained to an elm . The bull paced around the tree, dragging the heavy iron chain, which led to a groove in the bark . The groove deepened over the years. Though for whatever reason, it did not kill the tree. After some years, the family took their bull away. They cut the chain, leaving the loop around the tree and one link hanging down. Then one year, agricultural disaster struck Michigan in the form of Dutch Elm Disease. All of the elms lining the road leading to the farm became infected and died. Everyone thought that the old elm would be the next. The farm owners considered doing the safe thing: pulling it out and cutting it up into firewood before it died. But they simply could not bring themselves to do it. It was as if the old tree had become a family friend. So they decided to let nature take its course. Amazingly, the tree did not die. Nobody could understand why it was the only elm still standing in the county! Plant experts from Michigan State University came out to observe the tree. They observed the scar left by the iron chain, now almost completely covered by bark. The experts decided that it was the chain that saved the elm's life. They reasoned that the tree must have absorbed so much iron from the chain that it became immune to the virus. It's said that what doesn't kill you will make you stronger. Or, as Earnest Hemingway put it, "Life breaks us all, but afterwards, many of us are strongest at the broken places."
answer:
What actually saved the elm?


question:
The Rebellion was the career highlight for both leaders; Cumberland resigned from the Army in 1757 and died of a stroke in 1765. Charles was initially treated as a hero on his return to Paris but the Stuarts were once again barred from France by the 1748 Treaty of Aix-la-Chapelle. Henry Stuart's entry into the Catholic Church in June 1747 was seen as tacit acceptance the Jacobites were finished and Charles never forgave him. He continued attempts to reignite the cause, including a secret visit to London in 1750 but habitual heavy drinking made him argumentative and hard to work with. In 1759, he met French Chief Minister de Choiseul to discuss another invasion attempt but Choiseul dismissed him as incapable through drink. When his father James died in 1766, Pope Clement XIII refused to recognise him as Charles III, despite the strong objections of his brother Henry. Charles never visited Britain again and died in Rome in January 1788, a disappointed and embittered man.
answer:
Which happened first, Charles secret visit to London or his meeting with French Chief Minister de Choiseul?


question:
Spotlight at Salem Academy and College Academic Camp: Creative Writing, Environmental Education/ Science, Language Camp Address 500 Salem Avenue Winston-Salem, North Carolina 27101 USA (800) 833-1753 Salem spotlight is designed to arouse intellectual curiosity with emphasis on the experience and development of the individual... (more) Get more information about Spotlight at Salem Academy and College Caribbean Summer Sea Camp Academic Camp: Environmental Education/ Science Camp Address Off-Season Address Box 37 North Coast Road PO Box 1461 Little Cayman, BWI Princeton, New Jersey Cayman Islands 08542 USA (609) 933-4559 The Caribbean Summer Sea Camp is a one-week adventure on Little Cayman Island. Campers dive or snorkel to explore the wonders of coral reefs, and view the diverse life in the sea around the island. Coastal Camp at Headlands Institute Academic Camp: Environmental Education/ Science Camp Address Bldg. 1033 Golden Gate National Recreation Area Sausalito, California 94965 USA (415) 332-6961 The Coastal Camp at Headlands Institute combines marine and coastal ecology themes with hands-on educational games and exciting opportunities for discovery in the great outdoors. By promoting environmental work, Coastal Camp allows kids to become responsible earth citizens. Swift Nature Camp Academic Camp: Environmental Education/ Science Camp Address Off-Season Address W7471 Ernie Swift Rd 25 Baybrook Minong, Wisconsin 54859 Oak Brook, Illinois USA 60523 (715) 466-5666 (630) 654-8036 Located in the Northwoods of Wisconsin on a 1,500-acre lake, this small camp offers hands-on nature studies. Self accomplishment is promoted while competition takes a back seat: Horses, Swimming, Scuba, Skiing, Sailing, Canoeing, Arts & Crafts and much more.
answer:

Alice, a girl of 10, hopes to learn more about ecology by playing games. Which telephone number should she dial?