Common Knowledge.

buzzfeed.com; People Are Sharing "Common Knowledge Facts" They Learned From Their Jobs, And I'll Never Think Of These Professions The Same Way Again "A family owned grocery slicer is always more sanitary than a chain deli. Without fail. Typically, a family-owned establishment has two slicers, one for meat, one for cheese. They ALWAYS wipe them down between customers, and here's why..."; Sarah Aspler; May 15, 2023