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.
 Learn more about your ad-choices at https://www.iheartpodcastnetwork.com

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. Learn more about your ad-choices at https://www.iheartpodcastnetwork.com

What do the ul marks on so many products mean?

Whether the topic is popcorn or particle physics, you can count on BrainStuff to explore -- and explain -- the everyday science in the world around us.

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What do the ul marks on so many products mean?

What do the ul marks on so many products mean?