As one of the most complex organs on the human body, the eye continues to surprise over and over again, as scientists find out more about it. From pupils expanding at the sight of someone you love, to 500 visible shades of grey, find out more about the eye than you ever knew before! 1. Despite the amount of noise a new-born baby makes, they can’t actually produce tears when they cry: their tear ducts don’t start working until they are between 4 – 13 weeks old. 2. Both eyes have a blind spot on the back of the retina where the optic nerve attaches, however you won’t notice this, due to the way eyes work together to fill gaps in your vision. 3. Everyone around the world with blue eyes shares a common ancestor: the first person with blue eyes lived around 6,000 – 10,000 years ago, and before that, everyone had brown eyes. 4. If you wore glasses that flipped images upside down, your brain would eventually...
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