You can use a basic iPhone app to have private conversations with your friends — because not everything needs to be shared ...

Using variation selectors, you can conceal messages of arbitrary length within emoji, or indeed any unicode character. "To be ...

Now [Adric] has shown us a new use for them entirely – by writing hidden messages on them. It’s a remarkably simple hack, but ingenious all the same. [Adric] was pretty sure that the Quelab ...

If you're a fan of these brain-teasing optical challenges, then we have a fresh puzzle for you. A new illusion, shared on X ...

(2.5 mL) water, and rubbing alcohol in the bowl or cup. Do your best to break up any clumps of turmeric. Write a secret message on the yellow paper! To do this, dip the paintbrush or cotton swab into ...

To get the message back, you just do the opposite. Use grep to find the lines in the log file that contain the encoded data, and then put them through uudecode to get the original text back.

Now hit Send and your text will be delivered with the words hidden. The recipient will have to tap on the message to temporarily reveal what it says – and then after a few seconds, it will be ...

If you want to print hidden text in Word on Windows and Mac, then this tutorial will help you do that. By default, it doesn’t print any hidden text, but you can change the default setting and ...