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.
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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
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animation here … use the play, reverse and forward buttons to show how continental drift works…
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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.
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there is a new version of our famous ‘variables’ leaflet: it’s here
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