Stock Photo - A pool table in The Admirals Head pub. Before thermometers were invented, brewers would dip a thumb or finger into the mix to find the right temperature for adding yeast. This thumb in the beer is where we get the phrase rule of thumb.

Stock Photo: A pool table in The Admirals Head pub. Before thermometers were invented, brewers would dip a thumb or finger into the mix to find the right temperature for.

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