Description: Jeremiah Denton was a naval aviator who was captured and became a POW for eight years in Viet Nam. In 1966 he was forced to take part in a propaganda video. During the filming he pretended to be bothered by the lights but was in fact blinking out the word torture in Morse code. This confirmed for the first time that captured servicemen were indeed being tortured. Mr. Denton went on to serve as a U.S. Senator from the state of Alabama. This secret message could be used as a starting point for a unit on waves and information. Students could create and send messages of their own, hopefully under much more enjoyable conditions.
Description: In this video an analog and a digital television signal are compared. Many students today are not familiar with analog television and the problem of static. Analog television uses changes in the amplitude, frequency or phase of the radio waves to transmit information. Problems of this technology include susceptibility to interference (or static), color consistency, and a smaller image. Digital sends the information as a series of 0's and 1's that are converted into the pixels on the screen. It is difficult to find an analog television signals in the US but the radio is a great substitute.
Web Resource: Analog vs. Digital Television - Lifewire
Description: The Arecibo message was an interstellar radio message containing information about life on our planet. The message contained 1679 (semiprime) bits of information that could be organized into the graphic seen below. The message contained information on our planetary system, genetic information, human dimensions, and the Arecibo telescope.
Web Resources: Arecibo Message - Wikipedia