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.
In a database, every user account can be granted a number of privileges, which are also known as permissions. These privileges allow a particular user account to do certain things, like DELETE and UPDATE certain tables, CREATE a database, SELECT from a certain table, and many other things.