Paper can only be recycled 3 times, because the fibers get shorter and weaker each time the paper is recycled.
Dinosaur Air Conditioning
Dinosaur Air Conditioning New research suggests why some groups of dinosaurs
developed such huge nasal cavities. Larry Witmer, a paleontologist
at the Ohio University College of Osteopathic Medicine, has found
that the large nasal cavities probably provided a method of cooling
the dinosaurs' blood and keeping their brains from
overheating. 5 NOVEMBER 1999, P. 1073-1074
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