Jennifer R. Roberts, The Power of Patience, Harvard Magazine, 11–12/2013.
26
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27
Alexander Graham Bell, Discovery and Invention, National Geographic vol. 25 (06/1914): 650.
28
Yue Wang, More People Have Cell Phones Than Toilets, U. N. Study Shows, Time, 25.03.2013; Victoria Woollaston, How Often Do You Check Your Phone? Daily Mail, 08.10.2013.
