Beer is made out of water, malt, hops (the flowers of the Humulus lupus plant), and brewing yeast of the strain Saccharomyces cerevisiae. It owes its marvelous flavor to a great deal of chemistry. This video explains how beer is made.

The video is based on the article:

• The Oktoberfest Rearrangement,
  Klaus Roth,
  ChemViews Mag. 2013.
  https://doi.org/10.1002/chemv.201300098