These downloadable videos and animations are part of the multimedia package Stuff and Substance, developed by the Gatsby Science Enhancement Programme (SEP). They can be used to introduce a particle model to explain why a substance can exist in both the solid and liquid...

Paul develops infrared telescopes to observe galaxies.  The technology has also been adapted to diagnose cancer by looking at chemical signatures in the human body.  He emphasises the importance of problem solving and programming skills to work in his role. 

There are two cuts of the video – one aimed at...

This video demonstrates how the human eye will average or blend fast-flashing red, green and blue lights to produce violet light.  However, if a ball containing the red, green and blue lights are spun the individual lights are clearly visible.  This is because the eye will not merge the separate colours if they...