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There are three very good videos presented by Brian Cox in a series called "In Search of Giants" described and linked here. The first is particularly relevant.
The water molecules have an imbalance of charge which makes the Hydrogen parts of one molecule want to stick to the Oxygen parts of another molecule, this is called "Hydrogen bonding".
Robert Hooke (http://www.roberthooke.org.uk/) Robert Hooke was not only responsible for “Ut tensio sic vis” but also a good deal of building and mechanics. Find out more at this site to appreciate his contribution not only to our understanding of forces, but also his rivalry with Newton.
http://www.learner.org/teacherslab/science/light/ An excellent site, though of a demanding level. It covers shadows from multiple sources, coloured shadows, spectra and parallax by using a mixture of text and Java animations. The questions and puzzles are quite demanding – for example working out what a four-eyed alien would see, and where a player is on a pitch by looking at the strength and shape of his shadows. Applet Teaches you about shadows – includes some points about colour which are more than you need to know.
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