Why is it only some viruses are transmissible by blood, and how does the virus actually move from person to person?
Blood is perhaps the most important window through which we can peer into a person's health or illness.
An overview of the most common problems in our blood: bleeding disorders, clotting disorders and cancer.
Why do we have blood groups and how are they discovered?
Blood transports nutrients, hormones, proteins, vitamins and minerals around our body.
Here we look at how blood transfusions started as an experiment four centuries ago, and became the modern-day life saver they are.
Everything you never knew about the red stuff in your veins.