Researchers have found 41.4 crore plastic pieces, including nearly 10 lakh shoes and 3.7 lakh toothbrushes that washed ashore on Australia's Cocos (Keeling) Islands, home to only 600 people. The survey estimated the Indian Ocean islands' beaches are littered with 238 tonnes of plastic. "We only sampled a depth of 10 cm and couldn't access some debris hotspots," researchers said.