skoool.co.uk is a vast educational resource for teachers to use inventively and creatively in the classroom to add extra value to their classroom teaching of Maths and Science.

Enjoy!

This is one of my favourite sites.
Click on the menu on the left to revise the topics of simple machines.

This is another one of my favourite sites. Why do you need to buy those expensive encyclopedia when you can have it free from Wikipedia. Anyone can edit it.
But you still must be caution of the information available on the internet. Please do your own research on the topics.