In this challenge, I used a Smiggle Spy Pen to draw a full doodle using invisible ink that only appears under UV light! 🔦🖊️ ...

The pen has been designed to be compact and easy to use, you just plug it into a power socket and can start drawing anything within minutes. “We wanted to design a 3D printing device that could ...

What happens when you borrow the teacher’s pen and start doodling in class? In this hilarious and unexpected video, I ...