Using the concepts of efficiency, effectiveness, invention, and innovation, why the following technology prediction missed the mark?

1. "Nuclear powered vacuum cleaners will probably be a reality within ten years." Alex Lewyt, President of the Lewyt Vacuum Cleaner Company.

2. "Before man reaches the moon, your mail will be delivered within hours from New York to Australia by guided missiles. We stand on the threshold of rocket mail." Arthur Summerfield, U.S. Postmaster General.

3. "There is practically no chance communications space satellites will be used to provide better telephone, telegraph, television or radio service inside the United States." T.A.M. Craven, Federal Communications Commission (FCC) commissioner.

4. "Everyone's always asking me when Apple will come out with a cell phone. My answer is, 'Probably never.'" David Pogue, The New York Times.

5. "There's just not that many videos I want to watch." Steve Chen, CTO and co-founder of YouTube, expressing concerns about his company's long-term viability.