What is a virus? How does it affect humans and how does it spread? Doctors, virologists and scientists examine the spread of the Zika virus, what effect this growing epidemic may have on large populations, and possible next steps to stop the illness.
Nestled in the tissues of your neck is a small, unassuming organ that wields enormous power over your body: the thyroid. Emma Bryce explains how the thyroid, like the operations manager in a company, is tasked with making sure that all the cells in your body are working properly.