You can use dry-erase markers on a lot more surfaces than just a whiteboard—just about any non-porous surface can be used as a dry-erase board, including glass, stainless steel, and plastic.

But a dry erase marker won’t turn any heads. And this one holds its own little secret. It acts as a master key for hotel room door locks. This is really more of a repackaging hack. The exploit ...

When my kids were little, I did my very best to hide all our permanent markers where they couldn't get to them. But somehow ...