The composition of the mysterious balls that washed up on the shores of Australia last month has been revealed — and scientists say the truth is "much more disgusting" than they initially thought.

Scientists have solved the mystery of sticky black balls that began washing on beaches in Sydney, Australia last month. Thousands of the strange balls first began appearing in mid-October, including at the city's famous Bondi Beach,

Mysterious black spherical objects, initially suspected to be tar balls, washed up on Sydney's eastern beaches in October, leading to closures. Scientists identified them as 'fatbergs,' a disgusting concoction of sewage,