Brothers Jeff and Ron have been exchanging the same birthday card for over 40 years. Posted to Reddit by user venusreincarnate, the two have been sending this “Peanuts” card, featuring the character Linus, back and forth since 1973.

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“This Is The Age Of Ecology” says front of the card, and inside, “Don’t throw this card away, recycle it to a friend.” While there are a few gaps, about 84 cards were saved by using and reusing this one.

More info: venusreincarnate (h/t: aplus)