Water weeds invade Olympic sailing course

This might look like a carpet or woolly blanket, but it's really thick green algae that's causing big problems in China. The blue-green weeds are smothering the water in the coastal town of Qingdao - one of the main sailing venues for the Olympic Games. They're causing problems for sailors as they are very strong and stringy, making it really tough for boats to sail... [read full story]