Many Americans have noticed that relationships with neighbors aren’t what they used to be 20 or 30 years ago. A study from Harvard Medical School shows that 50 years ago, people talked about being neighbors in terms of friendships. Today, we tend to focus on good manners instead, like being quiet or keeping to ourselves. "People have all kinds of ideas about why this has changed," said David Burton, a community development specialist with University of Missouri Extension. "They blame things like fenced yards, fewer front porches, indoor entertainment, garage doors, or air conditioning. But the truth is, it really comes down to the choices each of us makes." Over the past 10 years, researchers have identified four main reasons why many people don’t connect with their neighbors like they used to:  loneliness, busyness, a retreat mindset, and too much focus on entertainment. Loneliness can make people avoid others. "It might sound strange, but when people are...