Here's a short story:

The process of making beer is known as brewing. A dedicated building for the making of beer is called a brewery, though beer can be made in the home and has been for much of its history. A company that makes beer is called either a brewery or a brewing company. Beer made on a domestic scale for non-commercial reasons is classified as homebrewing regardless of where it is made, though most homebrewed beer is made in the home. Brewing beer is subject to legislation and taxation in developed countries, which from the late 19th century largely restricted brewing to a commercial operation only. However, the UK government relaxed legislation in 1963, followed by Australia in 1972 and the US in 1978, allowing homebrewing to become a popular hobby. 

After boiling, the hopped wort is now cooled, ready for the yeast. In some breweries, the hopped wort may pass through a hopback, which is a small vat filled with hops, to add aromatic hop flavouring and to act as a filter; but usually the hopped wort is simply cooled for the fermenter, where the yeast is added. During fermentation, the wort becomes beer in a process which requires a week to months depending on the type of yeast and strength of the beer. In addition to producing ethanol, fine particulate matter suspended in the wort settles during fermentation. Once fermentation is complete, the yeast also settles, leaving the beer clear. (End of story)

Provide your best guess for the following question. Give ONLY the guess, no other words or explanation.

For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>

Here are a few examples of questions and answers:

Question: When does the yeast settle?
Guess: Once fermentation is complete

Question: What effect does that have on the beer?
Guess: leaving the beer clear.

Question: What's the process of making beer known as?
Guess: Brewing

Question: Are there whole buildings dedicated to just doing that?
Guess: Yes

Question: What are they called?
Guess: A brewery

Question: Where else has beer been made for much of its history?
Guess: In the home

Question: What scale is beer classified as when made for non-commercial reasons?
Guess: Homebrewing

Question: Are there any laws related to brewing beer?
Guess: Yes

Question: What about taxes?
Guess: Yes

Question: From which century have these restricted practices existed?
Guess: The 19th century

Question: Which government first relaxed them a bit?
Guess: The UK

Question: When?
Guess: 1963

Question: What country was next?
Guess: Australia

Question: Did the US relax its rules before or after the Aussies?
Guess: After

Question: When the US finally get on board with less restrictions?
Guess: In 1978

Question: What effect on homebrewing did that have in the states?
Guess: Homebrewing became popular

Question: When do you put in the yeast?
Guess: After  the hopped wort is cooled

Now answer the following question in the same format.

Question: What's a hopback?

A small vat filled with hops