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A nonprofit says authorities in the US capital Washington have failed to properly warn the public about a massive sewage leak into the Potomac River, thought to be among the largest such spills in the nation's history.

Over 113 years since the Titanic sank, engineers still have hopes of someday creating “unsinkable” ships.

A dome-fronted submersible sinks beneath the waves off Indonesia, heading down nearly 1,000 metres in search of new species, plastic-eating microbes and compounds that could one day make medicines.