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Why is seawater salty? What causes volcanoes to erupt? Why don't man-made satellites fall from the sky? What makes people sleepy? Answers to these questions and more are in this animated title which explores topics of nature, customs, and technology.
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6 2021 HD
0 2014 HD
0 2017 HD
8.5 2018 HD
6 2011 HD
5.8 2012 HD
6.2 2007 HD
8 2008 HD
3.5 2013 HD
0 2011 HD
4.8 2009 HD
6 1999 HD
7.639 2003 HD
6.6 2013 HD
6.6 2013 HD
5.8 2013 HD
6.2 2013 HD
8.7 1990 HD
5.8 2007 HD
5.75 1989 HD
