One to follow: Sciencebob.com

After a friend told me about a science lesson where the children made simple lava lamps (using justcooking oil, food colouring, water, and effervescent tablets in bottles), I went hunting for a video and came across this one from the Sciencebob website:

Delving further into the site, I found loads of child-friendly fun and simple experiments. Most are really visual and some are edible too. I particularly like this one where the children make diagrams of the moon phases using Oreos.

Two gooey and fun ones are making slime and making bouncy (rubber-like) balls. These both require Borax powder. It can be found in SOME supermarkets in the washing section but, if you can't find it there, it's often stocked in pharmacies.