A man has taken to social media to share the 'hardest logic puzzle in the world' - and it has taken some people 45 minutes to ...

Across the world, 8% to 10% of people have blue eyes, which is still second place to brown eyes, which 70% to 80% of all ...

But lighter eye color — blue or green, for example — does not seem to have had major evolutionary advantages, and so its emergence may have been driven by chance or sexual selection ...