In 1906 British researcher George Bidder launched hundreds of bottles into the North Sea.

More than a century later, Marianne Winkler found one of them as she walked along the beach in Germany. One glance at the bottle brought several questions to Winkler’s mind. “Where does it come from, who wrote it, and how long has it been traveling on the winds, waves and currents,” she asked?

The Telegraph writes the bottles were "specially designed to float just above the sea floor," and were "Used to prove, among other things, that the deep-sea current in the North Sea flowed east to west."

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Bidder successfully did that, and had no idea he would also create an adventure for Winkler and her husband over a century later.

Inside the bottle was a request to send the contents to the Marine Biological Association in return for a shilling. That's exactly what happened. "We found an old shilling. I think we got it on eBay," MBA communications director Guy Baker told German newspaper Amrum. "We sent it to her with a letter saying 'Thank you'."

More here.