20 Questions
http://www.q.20q.net
This is a great site that will leave you wondering. It's the Internet version of the game '20 Questions' and is an exercise in artificial intelligence. The sites been going for about 10 years and all the information the program has comes from users answering its questions.
Dance Mat Typing
http://www.bbc.co.uk/schools/typing/
Attention all two-fingered typists! This site borrows a concept from those machines in the Amusement Arcade where lithe 14 year olds wow the crowd by stamping out complicated patterns with their feet. Though you may be glad to hear, on this site your fingers to do the dancing.
EddNet Chemistry
http://chemistry.eddnet.net/
Funny, personal site devoted to the world of the chemist, lots of laughs and zaniness in between some really good information.
Exploratorium: Depth Spinner
http://www.exploratorium.edu/exhibits/depth_spinner/index.html
Here's an animated optical illusion from the Exploratorium. Watch the swirly spiral for 30 seconds - then look at your hand and yeooooucgh, it looks like the flesh is melting. Nurse, help!
Funology
http://www.funology.com
Funology is a colourful American site full of activities like recipes and crafts. There are also some really terrible jokes you can tell your friends! Check out the laboratory for some fun experiments.
Phys Link
http://www.physlink.com/Fun/Index.cfm
Ever wanted to know what happens at a physics party? This and more physics and astronomy fun.
Fun Factoids
http://www.npr.org/programs/science/factoids/
Bite-sized bits of fun science information, covering everything from turkeys to potatoes!
LaughLab
http://www.laughlab.co.uk/home.html
LaughLab was a scientific experiment to find the worlds funniest joke. The data has been gathered and analysed and you can read all the findings here.
Physics Limericks
http://www.aps.org/apsnews/limericks.html
Is there really a whole website devoted to physics limericks? Dont scientists have anything better to do?
Physics of Breakdancing
http://www.kent.wednet.edu/staff/trobinso/physicspages/
No, really! If you are already a breakdancer then see how you are bending the forces of physics to your will. If you are not, then this is unlikely to tempt you as it looks too much like hard work, but the physics is still very entertaining!
Science Hobbyist
http://www.eskimo.com/~billb/
Strange melange of themes and information, and some very weird experiments with your face mind and body!
Science Jokes
http://www.xs4all.nl/~jcdverha/scijokes/13_3.html
Humour is the best medicine. This site is dedicated to medical, biology, physical science, and chemistry humour of all kinds.
The Fun Science Ring
http://www.angelfire.com/ct/christaylor/funscience.html
Signpost site for sites devoted to fun science, quality of sites linked is a bit hit and miss, but Science Year has selected the best for this category.
Yucky Stuff
http://yucky.kids.discovery.com/
Yucky science stuff for kids including worms, roaches, and all the facts on the bodily nasties of puberty.