Technology
Radio Communication
Quick fact
The first transatlantic radio transmission, sent by Guglielmo Marconi in 1901, used a spark gap transmitter that emitted bursts of radio waves carrying Morse code—no voice, yet it revolutionized global communication.
Why this is interesting
Every time you tune a radio station or answer a mobile call, you are using invisible waves that travel at the speed of light. How does your voice turn into a signal that can fly through the air without any wires?