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It's been well-established by now but owing to a discredited International Agency for Research on Cancer claim, which environmental groups insist remains valid despite finding that a member of the Working Group had financial conflicts of interest (consulting for environmental groups) and signed an agreement with a litigation attorney before the claims were made public, concern has persisted.

In the United States, we just had another Supermoon, and at the end of this month we will have a Blue Moon (the second full moon in a month) with a lunar eclipse, which is pretty special. Though doomsday prophets like to make a lot out of those natural phenomena, the rest of us want to plan our vacations around them - the solar eclipse in the summer of 2017 caused the largest mass migration in America's history because everyone wanted the best view.
If you have a lot of assets to split, and splitting is easy, it's also easy to create ultimatums. When America was a poor country, people stayed together longer, families lived near each other, conflicts were resolved. You never went to bed angry, it was said.
The U.S. National Aeronautics Space Administration NASA has selected two finalist concepts for a robotic mission tentatively set to launch in the mid-2020s.

The two finalists pared down from 12 are Comet Astrobiology Exploration Sample Return (CAESAR), which seeks to bring back a sample from 67P/Churyumov-Gerasimenko, a comet that was successfully explored by the European Space Agency’s Rosetta spacecraft, to determine its origin and history. Led by Steve Squyres of Cornell University in Ithaca, New York, CAESAR would be managed by NASA’s Goddard Space Flight Center in Greenbelt, Maryland. 
Cosmic rays from supernovae can influence Earth´s cloud cover and how that influences climate could be useful for making better models.

A new study shows how atmospheric ions, produced by the energetic cosmic rays raining down through the atmosphere,help the growth and formation of cloud condensation nuclei – the seeds necessary for forming clouds in the atmosphere. When the ionization in the atmosphere changes, the number of cloud condensation nuclei changes affecting the properties of clouds.

More cloud condensation nuclei mean more clouds and a colder climate, and vice-versa.
Too much caffeine is bad for you. It's very risk to buy powdered caffeine for that reason. But it's addictive and people do it. Likewise, too much nicotine is bad for you and you can't shouldn't buy undiluted optically pure nicotine and start inhaling it. 

But young people will do risky things. Some may smoke marijuana or cigarettes, some may get addicted to alcohol or drugs. Young people who take up vaping rather than opioids today are a lot better off than a generation ago.