<p>This is a paragraph about <details> <summary>Gutenberg</summary>Johannes Gensfleisch zur Laden zum Gutenberg (/ˈɡuːtənbɜːrɡ/; c. 1400 – February 3, 1468) was a German goldsmith, inventor, printer, and publisher who introduced printing to Europe with the introduction of mechanical movable type printing press. His work started the Printing Revolution and is regarded as a milestone of the second millennium, ushering in the modern period of human history. It played a key role in the development of the Renaissance, Reformation, Age of Enlightenment, and Scientific Revolution, as well as laying the material basis for the modern knowledge-based economy and the spread of learning to the masses. </details> </p>
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