![Close-up-of-light-bulb-lighting-up-in-the-dark,-thin-metal-filament-sits-in-the-middle-of-the-bulb-and-shining-periodically](https://videocdn.cdnpk.net/videos/c803d10b-2c34-4af0-a056-42b54a2116f7/horizontal/thumbnails/small.jpg)
Close up of light bulb lighting up in the dark, thin metal filament sits in the middle of the bulb and shining periodically
1080p 00:13
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