The original version of this story appeared in Quanta Magazine. For thousands of years, if you wanted to send a secret message, there was basically one way to do it. You’d scramble the message using a ...

By entering certain strings of numbers and symbols into your phone's dialer, you can gain access to a world of hidden ...

The measles outbreak is a “call to action for all of us,” health secretary and longtime anti-vaccine activist Robert F. Kennedy Jr. wrote in an opinion essay for Fox News on Monday. “Vaccines not only ...

Using the Notes app on your iPhone as a messaging app is a surprisingly clever way to have a discreet conversation. You can use it to plan a surprise party for a loved one or disguise sensitive ...

You’re at a bar and strike up a conversation with a cute guy. You have so much in common: You were both competitive college athletes, have the same taste in TV and movies, want to try a local hike you ...