The Yangtze River dolphin was declared extinct a decade ago, but conservationists now claim to have seen it.
State's indigenous Standing Rock Sioux Tribe opposes construction of $3.7bn Dakota Access pipeline.
Scientists warn that despite our best efforts 'fires are going to keep getting bigger'.
Flooding will become more widespread even if hurricanes don't strike New York, due to rising sea levels.
Exposure to cosmic rays during deep space travel may damage the brains of astronauts.
An international expedition has identified the remains of ancient ships – some of which had never been seen before.
Some of the most common species in the UK saw declines of over 40% since last year.
Corals help scientists reconstruct uranium records from past 50,000 years and associated ice melt.
The storm was downgraded to a post-tropical cyclone as it moves into the Atlantic.
Fayetteville police shared a video of a child and its mother being rescued on Facebook.
Hurricane Matthew's casualties were spread across three different states.
The humpback whale calf nudged its mother to safety off the coast of Queensland.
The long-lost rune stone from 1,000 years ago has been discovered near a church in Sweden.
Simulations of the exoplanet's composition and radius show that it might harbour a large ocean.
The death toll on Haiti has risen rapidly, mainly in villages making contact with the outside world days after the cyclone hit.
Aviation Minister Lord Ahmad calls the agreement 'unprecedented', while Greenpeace remains sceptical.
Researchers believe this and other evidence point to widespread medicinal or ritualistic cannabis use.
The storm is set to hit the east coast of Florida which is primarily populated by Democrat voters.
Trackers hope 'seabots' will unlock mysteries of microscopic sea creatures in Pacific highway.
On 7 October, the celestial event will be observed by astronomy enthusiasts around the world.
Chimps, orangutans and bonobos display ability to understand a human's beliefs.
75% of the population at least occasionally read their horoscope but only 25% say they believe.
New tools and closer monitoring of volcanic gas emissions makes it easier to predict eruptions.
Archaeologists have represented the home of a rich man of Pompeii before the catastrophic eruption of 79 AD.
Ocean Cleanup spotters counted 1,000 large items of trash in 2.5 hours.
Potentially significant fault line could help explain why a large earthquake is way overdue.
Award has gone to scientists who made tiny machines out of molecules.
At least 11 deaths have been blamed on the fiercest Caribbean storm in almost a decade.
Like humans, capuchins were shown to have an integrated, episodic memory.
First observation of rainbow boa catching, killing and eating large adult female vampire bat on a cave floor.