Linked from
The 18 pages that link to Beer, each with the reason it gives.
CarbonationRelated: Fermentation and packaging determine much of beer’s carbonation.
BarleyRelated: Malted barley supplies fermentable sugars and characteristic flavor to many beers.
MaltoseRelated: Maltose is a major fermentable sugar in many beer worts.
MaltingRelated: Malted grain supplies much of beer's fermentable extract, color, and flavor.
Drinking strawRelated: Early drinking tubes are associated with consuming beer containing sediment.