Last week, we learned that an ozone hole had formed above the North Pole for the first time ever. But what exactly is an ozone hole, why are they so dangerous, and what can we do to fix them?
A hole in Earth's protective ozone layer above the Antarctic has become an annual event for the last 25 years, greatly increasing the South Pole's exposure to ultraviolet rays. Now, the same thing is happening above the Arctic Circle.
Last week a group of scientists reported in Science that they had created the tinest droplet of acid ever produced on Earth. It was created within a superfluid helium cluster at 0.37 kelvin. Observing this ultra-small acid drop allowed researchers to study how such droplets interact with water in our atmosphere to…