Donald Palmer's job involves studying, and teaching others how, the human body protects itself from infections and malfunctions, including cancer. He is especially interested in the way the immune system changes with age, and examines the surfaces of human cells using chemicals and instruments.

As a child...

An ecologist is a biologist who studies the relationship between organisms and their environment. A Levels: Biology, Chemistry, Geology, Maths

This film clip shows how steam is used to drive turbines in power stations which burn fossil fuels. It then looks at how turbines can be adapted to be driven by alternative energy sources, and examines the advantages and disadvantages of energy sources such as wind, to solar, biomass, hydroelectric power, tidal and...