Because of the second law of thermodynamics.
A fridge is essentially moving hot air from the inside of the fridge to the outside environment. By opening the door you are connecting the hot and cold reservoir.
opening doors
Education opens the doors to greater opportunities.
opening doors for guest helping/assisting guest in parking their cars opening doors for guest greeting guest in proper time of the day
The doors use magnets to hold them shut. The doors have knobs for opening.
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Speed in opening. Note: It StarTrek, the moving doors took three people to operate.
child locks
A key symbolizes the metephorical opening of ideas or doors.
doors.
Desperate Housewives - 2004 Opening Doors 4-14 is rated/received certificates of: Australia:M Netherlands:12 USA:TV-PG Venezuela:PG-13
opening doors and windows and using large fans will do it
Keyboard