You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "when was the first batman comic book published?" whose answer is Spring 1940.
Each document should contain about 30 words, and these documents should contain useful information.

Query: first batman comic book publication date
Useful Output:

Doc 1: Today, I am reviewing the first appearance comic book issue of Batman in Detective Comics #27! See the Dark Knight from his humble
Doc 2: Printed cartoons and comic strips were then published in newspapers from the 19th century, and in 1897 the first comic book, titled “The Yellow
Doc 3: Detective Comics #27 Readthrough: The First Appearance of Batman! · Comments4.
Doc 4: On March 30, 1939, Detective Comics #27 was released, introducing the world to the caped crusader – Batman.
Doc 5: A copy of 1939's 'Detective Comics' No. 27 has become the most expensive comic starring Batman.