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The asteroid Oumuamua ("scout from the distant past" in Hawaiian) was discovered on October 19, 2017 by astronomers at thr Pan-STARRS1 survey when it came close to Earth's orbit, within the orbit of Mercury, about a month after its closest approach to the Sun It was called an asteroid - but it may be a comet.

Why the confusion? There are more data about its trajectory. Oumuamua was unlike any asteroid or comet observed before. It sped past the Sun, approaching from "above" the plabe of the planets on a highly inclined orbit, moving fast enough (70,800 miles per hour as of July 1, 2018) to escape the Sun's gravitational pull and eventually depart our Solar System.
In 2016, more than 42,000 Americans died of an opioid-related overdose, which is alarming - but most of those deaths were not accidents by pain patients or suicides, they were recreational drug users.

There are numerous obstacles to making meaningful progress. For one, legitimate pain patients have become more stigmatized - government is blaming doctors and pharmacy rather than drug dealers - and that means people who want to kick their addiction are even more ostracized. 

A key part of palaeontology is reconstructing long-extinct creatures to understand what they were like when they were alive. Such knowledge allows us to answer fundamental questions about how they moved and interacted with their environment. How did they feed and reproduce? Which of today's organisms are they most like and most closely related to? 

It has challenges. The history of life can be distorted by the ways animals decompose and lose body parts as they decay - and the ways in which decayed bodies ultimately become fossilized. Like on-screen zombies in "The Walking Dead" that gradually deteriorate through time, fossils preserve only incomplete remains of the living body.

A new analysis estimates that if greenhouse gas emissions continue unabated, sea-level rise will endanger coastal wetlands across the United Kingdom.

That conclusion was derived by estimating salt-marsh vulnerability using the geological record of past losses in response to sea-level change. Data from 800 salt-marsh soil cores showed that rising sea levels in the past led to increased waterlogging of the salt marshes in the region, killing the vegetation that protects them from erosion.
A cosmic crash 8 billion to 10 billion years ago was a defining event in the early history of the Milky Way and reshaped the structure of our galaxy.

The Sausage Galaxy lost and the Milky Way won, fashioning both its inner bulge and its outer halo. The wreckage is all around us and the paths of the stars from the galactic merger earned them the moniker "the Gaia Sausage."
Enterotoxigenic Escherichia coli is a major cause of diarrhea in developing countries, and responsible for at least 300,000 deaths a year, according to the World Health Organization.

Effective vaccines have not been developed, so patients infected are treated with antibiotics and supporting measures. The emergence of multidrug-resistant bacteria has become a concern so the development of new treatment methods is ongoing.