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 special rule, known only to you and your intended audience.

The newly launched Aqara U400 is the first — and so far only — smart lock with Ultra Wideband Home Key support, and after using it for the past month, I don't think I can go back.

We use keys and locks all the time, but how do they work? There are many types of lock, but the most common is called a Pin Lock. Tears for boys stabbed to death in 'heinous' attack CBS News says it ...