Well into the age of email, we’re used to lightning quick communication. Waving around old flags looks pretty silly now. But this method of signaling was once built into a revolutionary communication ...

Email of the 18th century didn’t quite involve the internet or any of the current electronic devices we are obsessed with today. The optical telegraph essentially served the same function of ...

SAN JOSE — High above downtown San Jose, Adobe has launched a new semaphore puzzle contest to serve as the tech titan’s latest tricky optical telegraph that challenges people to crack its code. The ...