Unlock the full potential of your smartphone flashlight with this easy DIY projector tutorial! Watch as we turn ordinary ...

Everyone’s melted things with a small magnifying glass, but we wanted to see how far we could push the idea. Could a massive lens concentrate enough sunlight to melt a million-dollar gold bar? We ...

In antiquity, we see examples of magnifying crystals formed into a biconvex shape as early as the 7th century BC. Whether the people of that period used them either for fire-starting purposes or ...