It's all about recycling . . .

From CNN:

Brothers recycle birthday card for 29 years.

... It's a card-swapping tradition that started in 1975, when Floyd first received the birthday card from his brother.

In it, Linus of the Peanuts comic strip tells the reader, "This is the age of ecology! Don't throw this card away. Recycle it to a friend."

Floyd took the advice and sent it back to Earl. Earl followed suit the following year. And so on and so on.

For 29 years the brothers have kept their same-card exchange going, freshening the card up with one-line messages that now have taken up most of the card's open space.

Floyd, 80, receives the card each year around his December 10 birthday, then kicks it back to Earl, 73, in time to acknowledge his birthday on January 31.

"It's getting worn out a little bit," Floyd said.