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Experiments and activities
http://www.tryscience.com/
Ideas and experiments from the New York Hall of Science. Organised into categories such as Earth Sciences, Space Sciences, Medicine and Health.

http://www.krampf.com/
Try the experiment of the week!

www.spartechsoftware.com/reeko/
Reeko's Mad Scientist Lab!  A source of science and chemistry projects and experiments for parents, teachers, kids, and children of all ages

http://www.mylearning.org/
My Learning is a website for teachers and learners inspired by museum, library and archive collections in Yorkshire. On this site are the science based activities created by the Creative Minds STEM project, see www.mylearning.org/museums/museum.asp?museumid=20 

www.pbskids.org/zoom/activities/sci/
Lots of fun ideas covering all aspects science and engineering that would fit well into a one-hour Club session.

http://www.hunkinsexperiments.com/ 
Great ‘filler’ or ‘ice-breaker’ experiments which take about 5 minutes each. Most of these experiments use hardly any equipment and are great for catching pupils attention

www.einsteinyear.org/get_involved/physicstogo
20 quick physics related demos which use everyday resources. Includes video clips of each one demo and advice on delivery.

www.bizarrelabs.com/control.htm
A collection of classic home experiments and demonstrations.

http://www.learninggrid.co.uk/
Activities and competitions linked to motorsport

www.exploratorium.edu/science_explorer
US website with science experiments.

www.scienceprojectideas.co.uk
Lots of ideas for science projects covering Biology, Chemistry, the Environment and Meteorology and Physics.  Also includes advice on running projects, as well as fun facts and trivia.