A Ramadan etiquette guide for non-Muslims

There are 7 billion people in the world. And a full 22% of them – 1.6 billion – are fasting from sunup to sundown. Every day. For an entire month. It's Ramadan, the holiest month of the Muslim calendar. But what if you're not a Muslim – just a caring, considerate person. What should you do to ensure you don't come across as insensitive…