Favorite Theory:

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Principle of Maximum Congestion: People will always stop to talk in doorways, elevator doors, or other locations that are selected to maximize traffic congestion.

My Brilliant Discoveries:

bulletWhy it becomes dark at night:
bulletI noticed several years ago that there are large metal poles along the streets, and that in the evening when they are turned on, light collects at the tops of these poles and the sky becomes dark.
bulletIn the morning when they are turned off, there is light scattered across the sky.
bulletWhy it becomes hot in the summer:
bulletI noticed several years ago that in the late spring people start turning on machines (often placed in windows) that blow hot air outside.
bulletThese machines are particularly active on excessively warm days.
bulletIn the early fall, when they discontinue using these machines, the weather cools down.