AAAMath- reinforces math skills http://www.aaamath.com
National Geographic for Kids http://www.nationalgeographic.com/kids/
Are you a math magician? http://www.oswego.org/ocsd-web/games/Mathmagician/maths1.html
Interdependence and adaptation http://www.bbc.co.uk/schools/scienceclips/ages/10_11/interdependence.shtml