By DEIRDRE McCROHAN
Somewhere in the south Atlantic Ocean, at approximately 49 degrees latitude south, 50 degrees longitude east, there's a buoy bouncing around in the 10-foot-high swells with the words "Reed Raccoons" scribbled on its side with a giant Sharpie.
Tiburon native Jim Colletto, whose children attend local schools, helped drop the buoy there while on a recent six-week expedition to Heard Island, a 144-square-mile frozen volcano. The last time anyone set foot there was in 1997.
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