On one covert video, farm workers illegally burn the ankles of Tennessee walking horses with chemicals. Another captures workers in Wyoming punching and kicking pigs and flinging piglets into the air. And at one of the country’s largest egg suppliers, a video shows hens caged alongside rotting bird corpses, while workers burn and snap off the beaks of young chicks.

From lakes and grasslands with hippos and giraffes to a vast desert, North Africa's sudden geographical transformation 5,000 years ago was one of the planet's most dramatic climate shifts.

The transformation took place nearly simultaneously across the continent's northern half, a new study finds. The results will appear in an upcoming issue of the journal Earth and Planetary Science Letters.

Climate change could get worse quickly if huge amounts of extra heat absorbed by the oceans are released back into the air, scientists said after unveiling new research showing that oceans have helped mitigate the effects of warming since 2000.

Heat-trapping gases are being emitted into the atmosphere faster than ever, and the 10 hottest years since records began have all taken place since 1998. But the rate at which the earth's surface is heating up has slowed somewhat since 2000, causing scientists to search for an explanation for the pause.

Researchers have found the strongest evidence yet that aerosols from burning fossil fuels are affecting coral growth.

They say that these sooty particles can cool sea surface temperatures and limit the size of reefs.

But they also believe this chilling effect could prevent the corals from bleaching in warmer waters.

The research is published in the journal Nature Geoscience.

Long after a near-death experience, people recall the incident more vividly and emotionally than real and false memories, new research suggests.

"It's really something that stays in the mind of people as a clear trace, and it's even more clear than a real memory," said Vanessa Charland-Verville, a neuropsychologist in the Coma Science Group at the University of Liege in Belgium. She, along with colleagues, detailed the study online March 27 in the journal PLOS ONE.

Sam Parnia MD has a highly sought after medical speciality: resurrection. His patients can be dead for several hours before they are restored to their former selves, with decades of life ahead of them.

Parnia is head of intensive care at the Stony Brook University Hospital in New York. If you'd had a cardiac arrest at Parnia's hospital last year and undergone resuscitation, you would have had a 33% chance of being brought back from death. In an average American hospital, that figure would have fallen to 16% and (though the data is patchy) roughly the same, or less, if your heart were to have stopped beating in a British hospital.

When filmmaker Carla MacKinnon started waking up several times a week unable to move, with the sense that a disturbing presence was in the room with her, she didn't call up her local ghost hunter. She got researching.

Now, that research is becoming a short film and multiplatform art project exploring the strange and spooky phenomenon of sleep paralysis. The film, supported by the Wellcome Trust and set to screen at the Royal College of Arts in London, will debut in May.

Ever find yourself briefly paralyzed as you're falling asleep or just waking up? It's a phenomenon is called sleep paralysis, and it's often accompanied by vivid sensory or perceptual experiences, which can include complex and disturbing hallucinations and intense fear.

For some people, sleep paralysis is a once-in-a-lifetime experience; for others, it can be a frequent, even nightly, phenomenon.

Imagine if you were a super-villain who had taken control of all the world's gold, and had decided to melt it down to make a cube. How long would the sides be? Hundreds of metres, thousands even?

Actually, it's unlikely to be anything like that size.

Warren Buffett, one of the world's richest investors, says the total amount of gold in the world - the gold above ground, that is - could fit into a cube with sides of just 20m (67ft).

But is that all there is? And if so, how do we know?

A group of ancient lines in the archaeological zone of Buenos Aires, in Nazca, have been destroyed by heavy machinery, El Comercio reported.

According to the daily, the machinery belongs to a firm that is removing limestone from the area.

The lines are located near kilometer marker 444 of the Panamericana Sur Highway. The area adjacent to the lines have reportedly also been affected, due to land being removed from the area.

Food as a battery—that is what we would like you now to consider. But before we get to the full expression of that proposal, we need to review exactly how batteries function, so you can appreciate the beauty, and potential innovation, made possible by thinking through this metaphor.

Batteries are not storage containers for electricity, as one might assume. They don’t provide power because somehow someone pumped in the electricity and locked it in, and now it’s ready for use. Instead, they contain the potential for an electromagnetic reaction, which, if engaged, creates power. The battery consists of a negative solution (the anode) and a positive solution (the cathode) separated by the ions of the electrolyte. The extra electrons in the anode want to move to the cathode, but there is no path through the electrolyte between them.