A milky surprise

[mtbc]

We have the milkman bring our milk in the traditional glass bottles that one rinses and returns. A foil cap on the top seals the milk inside. I mentioned how in the recent cold weather the milk froze on the doorstep and lifted the lid: it was clean up and away from the bottle. Curiously, once the milk thawed, down came the lid back into place and I found it sealed once again quite tightly around the rim of the bottle as if time had simply reversed.

Update: On rinsing the bottle I notice milk encrusted in the groove around the outside of the rim. Perhaps the foil lid did not so much miraculously reseal itself as glue itself back on by means of spilled milk.