Sickle cell disease is an inherited blood disorder that occurs in 1 in every 375 African Americans. There is currently no cure for this life-shortening disease. These five video tracks will help you to understand exactly what sickle cell disease is and answer many of the questions surrounding it. They'll also explain its hereditary nature in people of African descent. This material forms part of The Open University course SK195 Human genetics and health issues.

Toilets save lives. We've compiled some resources to help raise awareness for the 3.6 billion people who do not have access to toilets and proper sanitation.

Germs are bad for you, aren't they?

Rats can smell tuberculosis. Dogs can smell cancer. Now they’re being trained to save your life. Emma Young reports.

 It looms over many of our lives, but what is Alzheimer's disease? Here's a guide:

Can fish provide an insight into brain diseases in people?

Daniel Wight looks at the high rates of teenage pregnancy and sexually transmitted infections, and whether sex education in schools is to blame

Kevin McConway describes the study of epidemiology and looks at the factors influencing outcome and interpretations

Test your knowledge on fat