He sticks some tape on his smartphone and colors it in. What he sees next is repulsing.

Every couple of weeks reports of influenza epidemics and gastrointestinal viruses appear on the news. In most cases, it’s a matter of insufficient hygiene and the spread of germs. The problem is that you can’t see these microscopic threats with the naked eye. But your phone will shine some light on the truth. Literally!

DIY Blacklight by heftyco
It's really alarming what's revealed. This little trick will now be part of my standard repertoire. Better safe than sorry! (Source)
Share this brilliant trick with all your friends!
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