Hedy Lamarr was an actress, film producer, and inventor. During World War II, she thought of creating a frequency-hopping signal that could not be tracked or jammed when she found out that the radio-controlled torpedoes could be easily set off course. So she and her friend composer George Antheil started to work on the early version of spread-spectrum communication and patented it in 1942 (filed using her married name Hedy Kiesler Markey). However, the US Navy was hesitant to implement any inventions coming from outside the military. But it was used later: an updated version was installed on Navy ships during the Cuban Missile Crisis in 1962. Today, various spread-spectrum techniques are incorporated into Bluetooth technology and are similar to methods used in legacy versions of Wi-Fi.