Two Scottish cities have been friendly rivals for centuries, each developing their own personality and strengths. This competition made both Edinburgh and Glasgow better, just like how sports rivalries push teams to improve.

In France, greeting someone isn't as simple as a handshake or hello. The number of kisses varies by region - two, three, or even four - and getting it wrong can be awkward. This complex social map shows how cultural rules help people connect, even when they're confusing.

In France, greeting someone isn't as simple as a handshake or hello. The number of kisses varies by region - two, three, or even four - and getting it wrong can be awkward. This complex social map shows how cultural rules help people connect, even when they're confusing.