It’s called invisible text, and it’s one of those digital tricks that’s clever, sneaky, and surprisingly easy. Here’s how it ...

I’m showing a super fun science craft—how to make secret Valentine's Day messages using just paper towels, markers, and water. In this video, I guide you step-by-step as I write hidden notes that ...

A Hillhouse student’s eyes widened as he applied grape juice and heat to what appeared to be a blank piece of paper — but instead held a secret message in invisible ink, written as part of a course ...