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Pulse Tech Tip: How to use your phone's flash to see hidden germs - Pulse Nigeria Posted: 11 Aug 2015 09:03 AM PDT Pulse Tech Tip: How to use your phone's flash to see hidden germs Pulse Nigeria And that certainly didn't stop one very clever YouTuber from turning his smart phone into a black light! Black light? Who needs a black light, you say. Well, black lights can actually be very useful for seeing germs that are otherwise invisible to our ...

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