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= Additional information =
= Additional information =
==Useful websites==
==Useful websites==
−[[Image:Walter-Levin.png|200px|left]]This is a college lecture by Prof Walter Levin explaining gravitation. Click [http://upload.wikimedia.org/wikipedia/commons/9/91/Newtonslawofgravity.ogg here] to see the video.<br><br>
+[[Image:Walter-Levin.png|100px|left]]This is a college lecture by Prof Walter Levin explaining gravitation. Click [http://upload.wikimedia.org/wikipedia/commons/9/91/Newtonslawofgravity.ogg here] to see the video.<br><br><br>
==Reference Books==
==Reference Books==