other bottles that are purposely not ballasted. Wooden blocks float higher in the water and thus are more influenced by wind—a design specially suited for simulating travel paths of plastic waste that is less dense than glass containers. An early-20th-century "bottom" (or seabed) drift bottle design by George Parker Bidder III involved weighting a bottle with a long copper wire that causes it to sink until the wire trails upon the sea bottom, at which time the bottle tends to remain a few inches above the bottom to be moved by the bottom current. A mushroom-shaped seabed drifter design has also been used. Seabed drifters are designed to be scooped up by a trawler or wash up on shore. Water pressure pressing on the cork or other closure was thought to keep a bottle better sealed; some designs included a wooden stick to stop the cork from imploding. Vessels of less scientific designs have survived for extended periods, including a baby food bottle a ginger beer bottle, and a 7-Up bottle. A low percentage of bottles—thought by some to be less than 3 percent—are actually recovered, so they are released in large numbers, sometimes in the thousands. Reported recovery rates for large-scale scientific studies vary based on the ocean of release, and range from 11 percent (Woods Hole, 156,276 bottles from 1948 to 1962, Atlantic), to 10 percent (Woods Hole, 165,566 bottles from 1960 to 1970, Atlantic), to 3.4 percent (Scripps Institution, 148,384 bottles from 1954 to 1971, Pacific). Oceanographic drift card recovery rates have ranged from 50 percent if released in densely populated areas (North Sea, Puget Sound) to 1 percent in uninhabited areas (Antarctica). Recovery rates decrease as bottles are released further from shore, with oceanographer Curtis Ebbesmeyer developing a rule of thumb that bottles released more than 100 miles from shore have recovery rates below 10 percent, and "only a few percent" of those released more than 1,000 miles from shore are recovered. About 90 percent of marine debris washes up on less than 10 percent of the world's coastlines, favoring beaches perpendicular to the dominant ocean current. Objects with similar buoyancy characteristics tend to collect together. A Scripps scientist said that marine organisms grow on the bottles, causing them to sink within eight to ten months unless washed ashore earlier. An unknown number are found but not reported. Time and distance Some drift bottles were not