Are they landing marks for aliens? Craters from World War II bombs?

The first pictures, which appeared in 2008 after being taken by a tourist, showed some strange circular formations in the shallow waters off the famous white cliffs of chalk on the island Møn in Denmark. And then they disappeared.

In 2011, the circles came back, and this time there were so many that they made it into media stories.
Since those first images appeared, people have searched for an explanation. 

No more killing the good bacteria along with the bad. An antibiotic "smart bomb" can identify specific strains of bacteria and sever their DNA, eliminating the infection and reducing multi-drug resistant bacteria.

The new approach works by taking advantage of a part of an immune system present in many bacteria called the CRISPR-Cas system. The CRISPR-Cas system protects bacteria from invaders such as viruses by creating small strands of RNA called CRISPR RNAs, which match DNA sequences specific to a given invader. When those CRISPR RNAs find a match, they unleash Cas proteins that cut the DNA.

Marijuana use has been involved in a sharp increase in fatal motor vehicle crashes, with rates nearly tripling since 1999. 

The prevalence of non-alcohol drugs detected in fatally injured drivers in the U.S. has been steadily rising and tripled from 1999 to 2010. Marijuana is the most commonly detected non-alcohol drug involved. 

North American bats are facing a tough new millennium. 600,000 per year are already killed due to government subsidies of wind energy and so far 7 million have died due to White Nose Syndrome.

While we are likely stuck with wind energy for the foreseeable future, there is hope for White Nose Syndrome. Scientists have discovered that the deadly WNS fungus can survive in caves with or without the presence of bats.

If you are stressed about giving a public speech or a presentation to your boss, it helps to talk about it - if the person you are talking to is also stressed out.

People benefit by spending time and conversing with someone whose emotional response is in line with theirs. Such an alignment may be helpful in the workplace.

What would make snakes scarier?

For spiders, the answer is easy. If you see one big enough to be feasting on Orc flesh in the caves under Mt. Doom, run, but snakes are tougher to make scary because they are slow.

Not all of them. Snakes may not look aerodynamic but some snakes can fly - literally. They slither in air, creating an S shape as they glide as much as 90 feet.

But how do they generate the lift to stay airborne? Jake Socha has spent much of his career figuring out flying snakes and says  "They look like they are swimming. They turn their whole body into one aerodynamic surface."