Millions of people will lose their sight because they overlooked a crucial eye problem. Learn about the most common causes of blindness – glaucoma, cataracts and detached retina. 

Want a behind the scenes peek at how the giant eye was constructed for this segment? Click here to watch the art department take the project from start to finish.

Click here to watch Part 2. 

You've heard of red wine and white wine but have you ever heard of blue wine? This blue version of wine is given a taste test to see how it compares to the classics.