Blue

In the physical, material sense, it's quite rare in nature... But, at the same time, it surrounds us. Babies can't detect it. The Himba tribe of Namibia can't describe it. Pablo Picasso turned to it after a friend committed suicide and in the West it's creative and reliable in the East it's cold and deathly. This week on the Why Factor, we're talking about something different - the colour blue.