BrainStuff

What do the ul marks on so many products mean?

Jul 8, 2015 · 1 min · 1.4 MB
0:00-1:26

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UL stands for 'underwriters laboratories,' a safety testing organization -- but what exactly does this group do, and why do they do it? Tune in and learn more about the UL mark in this podcast from HowStuffWorks.

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