When hundreds of golf ball-sized black balls mysteriously washed onto the beaches of Sydney, it caused enough alarm for the areas to be closed off to the public. But what scientists initially thought was a strange combination of fuel oil,

An environmental agency says black balls that washed up on Sydney beaches aren't tar, but a "complex composition" of "mixed waste."

The mysterious debris, initially thought to be tar balls, began appearing on beaches in Sydney last month Brook Mitchell/Getty Workers in hazmat suits cleaning up mysterious tar balls found in Sydney,

Oh, crap! Thousands of mysterious black balls that washed ashore and closed a stretch of popular Australian beaches last month were discovered to be mini blobs of poop. Initially believed to be made of tar,