Remember the magic of Yes & Know Books—the beloved invisible ink puzzles that transformed everyday moments into exciting detective work? Well, get ready to rediscover that wonder, because their maker, ...

Magician David Blaine will go to any lengths for a good magic trick. Chatting with PEOPLE for its One Last Thing page in this week's issue, Blaine, 52, recalled the last tattoo he got. "I did one with ...

Which invisible ink pens are best? Spies and conspirators have used invisible inks for millennia to send messages. In the modern age, invisible ink pens are an excellent way for grown-ups to ...

What looks like magic is often just a rule of physics or chemistry doing its job. Invisible ink turning brown, colours swirling on milk, water climbing uphill — it all feels like sorcery until you ...