Likewise, the beautiful shells and natural flotsam that decorate Australian beaches have a place and a purpose. For many of us, summer at the beach is a cherished memory and collecting seashells ...

Back in October, some of Sydney’s most popular beaches (including Bondi and Coogee ... but it’s likely that they could be pretty nasty – with the last batch found to contain PFAS chemicals ...

The discovery of the marble-sized balls comes after a similar incident in October closed Sydney's Bondi Beach, among other tourist hotspots.