1. Guidelines for Better PowerPoint Presentations By Tarak Brahmi September 2009
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11. Avoid this! The background is competing with the message and it is probably getting more attention.
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16. Alexander Graham Bell Inventor (1847 -1922) Bell's telephone grew out of improvements he made to the telegraph. He had invented the "harmonic telegraph" which could send more than one message at a time over a single telegraph wire. Bell reasoned that it would be possible to pick up and transmit the sound of the human voice using an adaptation of his "harmonic telegraph." In 1875, along with his assistant Thomas A. Watson, Bell constructed instruments that transmitted recognizable voice-like sounds.