in ancient times, no-one understood how blood flowed around the body. most theories were based on dissections on dead animals. aristotle believed that the arteries were full of air because they are usually empty in dead bodies.

research the work of Galen, Versalius, William Harvey and Malpighi.

Comments No Comments »

good way of showing how the reactivity of halogens changes down the group.
some youtube videos
video 1 chlorine, bromine, iodine
video 2 chlorine (go to about 55secs)
video 3 iodine

Comments No Comments »

animation here … use the play, reverse and forward buttons to show how continental drift works…

Comments No Comments »

ships captain letters

Comments No Comments »

healthy diet leaflets 8x4

Comments No Comments »

This applet simulates the dynamics of simple atoms and molecules in a two-dimensional universe.

The force between the molecules is weakly attractive at short distances, but strongly repulsive when they touch. Use the applet to explore phases of matter, emergent behavior, irreversibility, and thermal effects at the nanoscale. link is here.

Comments No Comments »

there is a new version of our famous ‘variables’ leaflet: it’s here

Comments No Comments »

fire safety posters 7y5

Comments No Comments »

water softener posters 9y6

Comments No Comments »

how they work 1
how they work 2
how they work 3 (plus lots of other questions and answers)
pictures of water softeners

water softener diagram

Comments No Comments »