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The egg in the bottle

After heating an empty milkbottle in boiling water the bottle is put on the table and a hard-boiled, peeled egg is placed on the opening of the bottleneck.
(Image 1)

Bild 1

Shortly after placing the egg on the opening of the bottleneck it begins to move through the bottleneck into the bottle. (Image 2)

Bild 2

What causes this effect?

The buttons on the right side will lead you to some hints to the solution. You can either choose one or several consecutively.

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