Question: Nightcrawler (Kurt Wagner) is a fictional superhero appearing in American comic books published by Marvel Comics, commonly in association with the X-Men. Created by writer Len Wein and artist Dave Cockrum, he debuted in the comic book Giant-Size X-Men #1 (May 1975). Nightcrawler is a member of a fictional subspecies of humanity known as mutants, who are born with superhuman abilities. Nightcrawler possesses superhuman agility, the ability to teleport, and adhesive hands and feet.

For a time, Kitty Pryde and Nightcrawler express some resentment over the X-Men's failing to contact them after their supposed deaths. Following the wedding of Captain Britain and Meggan, Excalibur disbands and Nightcrawler returns to the X-Men with Shadowcat and Colossus. Yet, as soon as they return, they face a group of impostors following Cerebro, in the guise of Professor X.  Wanting to devote more time to priesthood, Nightcrawler shares team leadership with Archangel. However, his work as a priest is retconned to be an illusion; he had, in fact, never attained priesthood. He has also met his half-brothers Nils Styger, alias Abyss, and Kiwi Black. With them, Nightcrawler defeated his father Azazel, who had tried to use him as a pawn in escaping his prison.  Later, Nightcrawler served as the new leader of the Uncanny X-Men team alongside Wolverine, Bishop, Psylocke, Cannonball, and Marvel Girl. In the last mission against the Foursaken, Nightcrawler took Marvel Girl, Psylocke, Bishop, and Cannonball to Central Park. He later helped Storm liberate Africa from her uncle's control.  Afterwards, Professor X recruited him, along with Darwin, Havok, Marvel Girl, Warpath, and Polaris, to participate in a space mission to stop Vulcan from laying waste to the Shi'ar empire. During the battle with Vulcan, Nightcrawler helps get the injured Professor X and Darwin back to their spaceship. While there, trying to save Professor X, Lilandra sent the ship on its way back to Earth, leaving half the team behind.  Kurt is still part of Professor X's team, helping Charles find Magneto before the government does, while the rest of the team search for the Morlocks.

Using a quote from the above article, answer the following question: What was it about?
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Answer: Nightcrawler served as the new leader of the Uncanny X-Men team alongside Wolverine, Bishop, Psylocke, Cannonball, and Marvel Girl. In the last mission against the Foursaken,

Problem: David Gaub McCullough (; born July 7, 1933) is an American author, narrator, historian, and lecturer. He is a two-time winner of the Pulitzer Prize and the National Book Award and a recipient of the Presidential Medal of Freedom, the United States' highest civilian award. Born and raised in Pittsburgh, McCullough earned a degree in English literature from Yale University.

After the success of The Johnstown Flood, two new publishers offered him contracts, one to write about the Great Chicago Fire and another about the San Francisco earthquake. Simon & Schuster, publisher of his first book, also offered McCullough a contract to write a second book. Trying not to become "Bad News McCullough", he decided to write about a subject showing "people were not always foolish and inept or irresponsible." He remembered the words of his Yale teacher: "[Thornton] Wilder said he got the idea for a book or a play when he wanted to learn about something. Then, he'd check to see if anybody had already done it, and if they hadn't, he'd do it." McCullough decided to write a history of the Brooklyn Bridge, which he had walked across many times.  To me history ought to be a source of pleasure. It isn't just part of our civic responsibility. To me it's an enlargement of the experience of being alive, just the way literature or art or music is.  - David McCullough  He also proposed, from a suggestion by his editor, a work about the Panama Canal; both were accepted by the publisher. Critics hailed The Great Bridge (1972) as "the definitive book on the event."  Five years later, The Path Between the Seas: The Creation of the Panama Canal was released, gaining McCullough widespread recognition. The book won the National Book Award in History, the Samuel Eliot Morison Award, the Francis Parkman Prize, and the Cornelius Ryan Award. Later in 1977, McCullough travelled to the White House to advise Jimmy Carter and the United States Senate on the Torrijos-Carter Treaties, which would give Panama control of the Canal. Carter later said that the treaties, which were agreed upon to hand over ownership of the Canal to Panama, would not have passed had it not been for the book.

What did critics say

Answer with quotes:
Critics hailed The Great Bridge (1972) as "the definitive book on the event."