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 did the self balancing scooter come out?" whose answer is 2014.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when was the self-balancing scooter invented
Useful Output:

Doc 1: The hoverboard in its current form was invented in 2013 and took off around 2016. Popular names for the device include: Hoverboard; Self-
Doc 2: This featured on the first hoverboard, which appeared in the United States in 2001 and was named Segway by its inventor, Dean Kamen, an engineer
Doc 3: The hoverboard was invented in 2014 by the American Shane Chen. This man is a true inventor and has invented also the monowheel.
Doc 4: In addition, ArcaSpace has designed a fully functional hoverboard, called the ArcaBoard, that became available for consumers on April 15, 2016
Doc 5: Inventor Dean Kamen introduced the Segway as a “self-balancing human transporter,” with internal gyroscopes that “sensed” the direction that