You're a secret agent, and you start to notice strange symbols everywhere you look. Can you decipher their meaning – and work out the link between them? Use the morse code guide below to help! What ...

Why does the landscape remain lit 30 to 45 minutes after the sun has set? Harriett Drake, Fayetteville, Georgia What you’re seeing then is twilight. From wherever you’re standing, shortly after sunset ...

Amateur radio operators, the last bastion of the dot-dot-dash, have long been required to pass a Morse code test to earn a license from the U.S. government. After years of fielding complaints from a ...

A character code invented by Samuel Morse that is represented by the duration of a single tone. Written as dots, dashes and spaces, the first Morse code message was sent in 1844 over a newly ...