Great scientists change the way we view the world.

Doing that usually means smashing an old, entrenched idea - often making enemies in the process.

Before being proven and accepted, a great theory can be subjected to harsh criticism and its proposer can be mocked, rejected, even vilified.

Sometimes a religious authority is on the attack, other times it's the scientist's colleagues - either way it takes special determination to stick to an idea others believe is clearly wrong.

Across the world's great deserts, a mysterious sheen has been found on boulders and rock faces. These layers of manganese, arsenic and silica are known as desert varnish and they are found in the Atacama desert in Chile, the Mojave desert in California, and in many other arid places. They can make the desert glitter with surprising colour and, by scraping off pieces of varnish, native people have created intriguing symbols and images on rock walls and surfaces.

How desert varnish forms has yet to be resolved, despite intense research by geologists. Most theories suggest it is produced by chemical reactions that act over thousands of years or by ecological processes yet to be determined.

Deepening the mystery of human origins, researchers Thursday offered the most complete view yet of fossils from a puzzling forerunner of humankind, revealing that these creatures were, from head to heel, a collage of primitive and modern anatomy.

In six research papers published in Science, an international team described how the hominids had almost-human hands attached to apelike arms, a rib cage that was narrow like an ape's at the top but more humanlike lower down, and a spine that likely had the same number of vertebrae as a human.

It is 80 years since hotel manageress Mrs Aldie Mackay first reported seeing a "whale-like fish" in the waters of Loch Ness.

Now an academic at St Andrew's University is trawling through 1,000 eye-witness accounts since to see what they can tell us.

He wryly notes more than a few hotel proprietors among typical spotters. So is "Nessie" just a conspiracy to boost tourism?

It was 14 April 1933 and Mrs Mackay, manageress of the Drumnadrochit Hotel, was driving with her husband along the road to Inverness.

The UK's nature reserves act as 'ecological welcome mats' to new species, according to scientists.

Since the 1960s, there has been a natural influx of wetland bird species from continental Europe.

Species such as whooper swans, Cetti's warblers and little egrets have used the nature reserves to colonise new areas of the UK, found the scientists.

As part of a study on impacts from the world’s most widely used class of insecticides, nicotine-like chemicals called neonicotinoids, American Bird Conservancy (ABC) has called for a ban on their use as seed treatments and for the suspension of all applications pending an independent review of the products’ effects on birds, terrestrial and aquatic invertebrates, and other wildlife.

“It is clear that these chemicals have the potential to affect entire food chains. The environmental persistence of the neonicotinoids, their propensity for runoff and for groundwater infiltration, and their cumulative and largely irreversible mode of action in invertebrates raise significant environmental concerns,” said Cynthia Palmer, co-author of the report and Pesticides Program Manager for ABC, one of the nation’s leading bird conservation organizations.

In the fall of 1972, then-President Richard Nixon signed the Marine Mammal Protection Act, providing sweeping protections for whales, dolphins, seals and other species swimming in U.S. waters whose populations had dwindled due to commercial fishing and accidental killing.

The law invigorated conservation efforts and prohibited hunting, killing, capturing and even harassing marine mammals (which we're reminded of when beachgoers in Florida get caught riding manatees or sickly sperm whales.)

LOS ANGELES (AP) — Stephen Hawking, who spent his career decoding the universe and even experienced weightlessness, is urging the continuation of space exploration — for humanity's sake.

The 71-year-old Hawking said he did not think humans would survive another 1,000 years "without escaping beyond our fragile planet."

"If you understand how the universe operates, you control it in a way," he said.

NASA is developing a lunar rover to find and analyze water and other materials trapped in deep freezes at the moon’s poles and to demonstrate how water can be made on site.

Slated to fly in November 2017, the mission, called Regolith and Environment Science and Oxygen and Lunar Volatile Extraction (RESOLVE), will have a week to accomplish its goals.

New photos from NASA's Cassini spacecraft show that an icy cloud is growing over the south pole of Saturn's largest moon, Titan, hinting that a seven-year fall has taken hold at the cloudy moon's southern realm.

Scientists are not sure what the budding cloud is made of, but the same icy haze has been clearing over Titan's north pole, where it is currently springtime.

"We associate this particular kind of ice cloud with winter weather on Titan, and this is the first time we have detected it anywhere but the north pole.

A population of 200 of the world's rarest orangutans was found tucked away in the forests of the island of Borneo, according to the Wildlife Conservation Society (WCS).

All subspecies of Bornean orangutans are listed as endangered by the International Union for Conservation of Nature. But scientists estimate just 3,000 to 4,500 individuals are left in the subspecies known as Pongo pygmaeus pygmaeus, making them the most severely threatened.