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Just like some people are overweight but healthy - an obesity paradox - some people are thin but have a three-fold higher risk of mortality and/or cardiovascular events.

Weight is not the best way to understand metabolic health, according to an analysis of lean, overweight and obese people.

A new paper claims that ~20 percent of normal weight adults are still metabolically unhealthy and have a higher risk of mortality and/or cardiovascular events than metabolically healthy obese subjects. Oddly, a reduced accumulation of fat in the lower body puts lean people at risk.

One size does not fit all
Satellite data have detected widespread water within ancient explosive volcanic deposits on the Moon. That means its interior may contain more indigenous water than previously believed. The ancient deposits are believed to consist of glass beads formed by the explosive eruption of magma coming from the deep lunar interior.
There is ongoing concern about species extinction but it isn't just the fact that 99.999% of species have never been cataloged, so it's impossible to know how many are extinct, it's that Mother Nature may cause it long before we could.

A new study suggests nature's ecological web is so tenuous that it's amazing anything survived this long; even the smell of a predator can have disastrous effects in populations of small size in flies. They spend less time eating, more time being vigilant, have less sex, and produce fewer offspring. 
It's not an 80/20 rule but if you are addicted to opiods you are likely to be visiting a small number of physicians in Ontario, according to a new analysis.
At a distance of a mind-blowing 750 million light years from Earth, astronomers using the Very Long Baseline Array (VLBA), a system made up of 10 radio telescopes across the U.S., say they've been able to observe and measure the orbital motion between two supermassive black holes.

They did it by observing several frequencies of radio signals emitted by these supermassive black holes. Over time, they have essentially been able to plot their trajectory and confirm them as a visual binary system. In other words, they claim they've observed these black holes in orbit with one another, though it's really inference.
In early times, a raven could be a bad omen, and a new study finds that ancient people were not wrong in thinking the raven might be planning on using a negative event to full advantage. It turns out, according to the paper, they plan ahead, just like humans, and can even forgo an immediate reward in order to gain a better one in the future, which at least some humans do. Great apes too.

Ravens and great apes have not shared a common ancestor for over 300 million years, so what explains it? Evolution is not a straight line and the authors speculate that the cognitive "planning" abilities they share in common re-appeared, on a separate evolutionary path, in the birds.