PLYMOUTH, ENGLAND—Marine biologist George Parker Bidder threw some 1,000 bottles into the North Sea in batches more than 100 years ago as part of his research into the patterns of currents. Now, 108 years later, one of those bottles has washed up in Germany, where it was found by a retired postal worker. She and her husband removed the note from the bottle and followed its instructions to fill in the date and where it was found, and then put it in an envelope and mailed it back to the Marine Biological Association. The card promised a one-shilling reward. “We found an old shilling, I think we got it on eBay. We sent it to her with a letter saying thank you,” Guy Baker, communications officer for the Marine Biological Association, told The Guardian. Bidder’s bottles helped him to show that the deep sea current in the North Sea flowed from east to west. To read about the discovery of a WWII-era military courier pigeon, go to "Let Slip the Pigeons of War."