Does a fridge door close by suction?

I think yes it does and it cant be magnetic field b'coz there is rubber insulation between the main body and the door and magnetic power may not be active through it.

There is a magnetic strip inside the rubber. Also inside the fridge body the "warm" coolant pipe being returned to the compressor for cooling is passed behind the door seal area to stop it from freezing if moisture is on the door seal!

James is right, there is a strip of magnetic material within the rubber seal around the door. Put a paper clip or other piece of iron based material on it and it will stick to it to verify that. If you've ever had to clean a dirty or slightly moldy seal on a fridge you will usually find that it's a lot harder to open than it was before and that's because the magnetic strip is now making much better contact.

A properly installed refrigerator will also be adjusted so that the door swings closed if let go, but that doesn't affect how difficult it is to open, but it does make it easier to close. There may be medical or scientific cooling units that also use a suction system to ensure the health and safety of workers, but household fridges just use a magnetic seal to keep them closed. If they used a suction or vacuum system, then they could open during a power outage and the best way to keep your perishables cool is to not open the thing when the electricity goes out so it stays cold as possible.

Old fashioned ones used a latch, but that was a very dangerous safety hazard to children playing in discarded units.

Long time Dad and Husband in charge of cleaning difficult, really icky, or hard to reach stuff around the house.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.