Paper can only be recycled 3 times, because the fibers get shorter and weaker each time the paper is recycled.
Sounds wild
Sounds wild Studying populations of creatures in the wild may
now be easier thanks to John Spiesberger of the University of
Pennsylvania. Using a computer software program linked to different
microphones, Spiesberger found that he could locate hard-to-find
creatures from their calls, when they are hidden in dark
rainforests or oceans. 9 OCTOBER 1999, P. 17
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