1. Historical background of materials

2. The Stone Age (pre-2500 BC)
Hard/brittle materials used to make earthenware, tools and weapons.

3. Stone Age tools
One of the most important advancements in human history was the development and use of tools. Tools allowed hominids to become the masters of their environments, to hunt, to build, and to perform important tasks that made life easier for them. The first tools were made out of stone. Thus, historians refer to the period of time before written history as the stone age.

4. Bronze Age hut
The Bronze Age ( 2500 BC to 500 BC)

5. Bronze Age tools
Hard, tough material that is quite malleable.

6. Iron Age hut
The Iron Age ( 500 BC to 1850 AD)

7. Iron Age tools
These are hard, tough, ductile and cheap. They were used to make sophisticated tools, bridges, ships etc.

8. Ironbridge in Shropshire
The world's first cast iron bridge was built over the River Severn at Coalbrookdale in Not only iron founders and industrial spies flocked to see this wondrous bridge, but also artists and travellers. The Bridge had a far reaching impact: on local society and the economy, on bridge design and on the use of cast iron in building. The story of the bridge's conservation begins in 1784 with reports of cracks in the Southern abutments, and is brought up to date with the English Heritage sponsored work of 1999.

9. Old Severn bridge
19th Century: steel (an alloy of iron) became available. This had increased strength and lower brittleness. This allowed larger structures to be made.

10. Carbon fibre used to make parts for some cars!
20th Century: composite materials (synthetic) and plastics became available, which provided greater strength and flexibility together with a low density. These proved to be particularly useful in the aircraft and civil engineering industries.

11. Molecular machine
Future trends: high temperature superconductors; nanotechnology, which enables new materials to be synthesised at a molecular and atomic level; advanced materials for electronic and photonic devices (e.g. optical computing) etc.

12. Acknowledgements
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PowerPoint slides compiled by John Mascall of The King’s School, Ely