How do you tell the difference between a person who is lost and someone who is casing a house?

Should US schools group children by reading ability?
Will Australia's rugby union team become more consistent under new coach Les Kiss?
Why does everyone on Earth want me to live a horrible, lonely life because of competition?
Would you ever report a neighbor for having a lot of late-night visitors?
Why do we assume that a stranger who avoids eye contact is hiding something?