SpeedFan can report the speeds of each fan and it can even change their speed based on current temperatures. This lowers noise and improves computer experience. SpeedFan can access the voltages reported by the hardware. This can help to identify odd issues with computers resetting under stress, for example.
So while securables created by the database owner actually are owned by dbo, this is still the user that created them. Also, most objects are probably not created by the database owner itself, so this still does not explain why most securables end up with dbo as owner.
Database Users are database level security principals, not server logins. Logins are given access to a database user by associating a database user with a login ID. The User then refers to the login's identity in a particular database. Additionally, all users other than SA, can be associated with one or more Roles. When a database is created, a DBO (Database Owner) Role is automatically created, which has full privileges inside the database.