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The top three scientific explanations for ghost sightings

From ghosts to ghouls, witches to wizards, Halloween is the one time of the year when people come together to celebrate everything supernatural. But beyond the fancy dress and trick or treating, belief in ghosts is actually relatively common – with 38% of people classifying themselves as believers and a similar number having actually reported seeing one.

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Gene study clears 'Patient Zero' as cause of US HIV epidemic

Genes taken from archived blood samples show the U.S. AIDS epidemic started in New York in the early 1970s, definitively debunking the long-held belief that the virus was spread in the early 1980s by a flight attendant who became vilified as "Patient Zero" for seeding the U.S. outbreak.

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Who lives longest: meat eaters or vegetarians?

Our ability to live a long life is influenced by a combination of our genes and our environment. In studies that involve identical twins, scientists have estimated that no more than 30% of this influence comes from our genes, meaning that the largest group of factors that control how long a person lives is their environment.

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A virus could manipulate neurons to reduce your desire to drink alcohol

About 17 million adults and more than 850,000 adolescents had some problems with alcohol in the United States in 2012. Long-term alcohol misuse could harm your liver, stomach, cardiovascular system and bones, as well as your brain.

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How chloroform went from a beloved sedative to a crime-fiction trope

To an outside observer, the gathering of medical professionals in Edinburgh, Scotland in November 1847 looked suspicious. Some physicians were slumped unconscious in their seats. Others staggered around, intoxicated and giggling, taking intermittent sniffs of the pleasant vapor emitting from rags they held close to their faces. One man was hypervigilant, paranoid eyes darting around for any sign of trouble.

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Scientists raise alert level for Alaska volcano after explosion detected

Scientists raised the alert level for a remote Aleutian volcano on Monday after an explosion was detected on the mountain and heard by residents of a tiny village some 45 miles (72 km) away, a monitoring website said.

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Hundreds in Los Angeles protest climate change, North Dakota pipeline

Hundreds of people gathered in Los Angeles on Sunday to protest against climate change and show support for activists demonstrating against the construction of an oil pipeline in North Dakota.

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Genetics play a key role in how your body metabolizes caffeine

Genetic variants play a key role in how individuals metabolize coffee. Some can drink coffee before bed and go right to sleep, while others a wired after just a single cup. Studying how genes impact coffee consumption habits is nothing new. A 2014 study identified genetic variants that are associated with coffee consumption behavior. Two variants…

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Cosmic wonders - Caught in the web of the Red Spider Nebula

Lola Gayle, STEAM Register The Red Spider Nebula (NGC 6537), located 3,000 light-years away near the heart of the Milky Way in the constellation of Sagittarius, is a striking ‘butterfly' or bipolar (two-lobed) planetary nebula. Planetary nebulae are the glowing embers of ordinary stars, such as our Sun. At the end of their lives these stars…

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Scientists think the common cold may at last be beatable

Time and again, Martin Moore's children get sick with a cold. He hauls them to their doctor, who then informs him that there's nothing to be done aside from taking them home and waiting it out. The experience is maddening for Moore - especially because he's a virologist. For everything that virologists have learned about rhinoviruses…

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Einstein proved right yet again as largest ever map of the universe’s voids solves major puzzle

Since its discovery in 2008, astronomers have been puzzled by a cosmic mystery so vexing that it has even led some to question whether the general theory of relativity – Einstein’s masterpiece theory of gravity – is wrong on cosmic scales. The trouble is that light travelling through the universe does not seem to be affected by the gravity of large structures such as galaxy clusters in the way that Einstein had predicted.

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‘Essentially witchcraft': A former naturopath takes on her colleagues

Britt Hermes once considered herself a doctor. Now, she's an apostate. Hermes spent three years practicing naturopathy, a broad-reaching form of alternative medicine that focuses on "natural" care, including herbal remedies, acupuncture, and the discredited practice of homeopathy. But unease about a colleague's ethics led her to look more closely at her profession - and what…

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What do we know about marijuana's medical benefits? Two experts explain the evidence

Currently 25 states and the District of Columbia have medical cannabis programs. On Nov. 8, Arkansas, Florida and North Dakota will vote on medical cannabis ballot initiatives, while Montana will vote on repealing limitations in its existing law.

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