Communication with Light
Signal Lamp
http://en.wikipedia.org/wiki/Signal_lamp
Morse Code
http://www.omniglot.com/writing/morsecode.htm
Air Traffic Control Towers
Optical Communication
http://en.wikipedia.org/wiki/Optical_communication
Using light to carry information
Heliograph
http://en.wikipedia.org/wiki/Heliograph
Plants and light
http://en.wikipedia.org/wiki/Photoautotroph
Think:
Purposes?
Why do we care?
What interests us about light?
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