Affirmative action programs at universities are under threat by the Trump administration. That could be especially damaging to medical education. Who knows who holds the idea for the next great cure?
Why is it only some viruses are transmissible by blood, and how does the virus actually move from person to person?
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.