Top 10 most dangerous volcanoes

At the number one spot is the Japanese island of Iwo Jima.

6 million years of human evolution in 1 minute

Mesmerizing reconstructions of long-lost human ancestors - created using fossil discoveries and forensic techniques - from a 2013 book published by Yale Press.

6.5-magnitude earthquake in Greece

Two are reported dead in the 6.5-magnitude earthquake, which struck just off the western Greek island of Lefkada on the morning of November 17.

What triggers supervolcano eruptions?

Supervolcanoes - massive eruptions with potential global consequences - don't appear to follow the conventional volcano mechanics, say researchers.

Weather disasters linked to climate change

Thirty two groups of scientists in 20 countries analyzed 28 weather disasters in 2014 - and found half of them linked to human-caused climate change.

6.8-magnitude earthquake strikes Chile

Strong earthquake along coast of central Chile. Same approximate region as much more powerful quake, two months ago. No tsunami warning. No immediate reports of damage or injuries.

El Niño already disrupting ocean food web

Scientists report the loss of phytoplankton - at the base of the ocean food web - from this year's strong El Niño. It's all part of a fascinating cycle of boom or bust for marine animals.

What is El Niño?

A big El Niño is developing in 2015, say scientists. This NASA video explains El Niño and its impact on the marine food web.

Antarctica’s ozone hole in 2015

The 2015 Antarctic ozone hole formed later than usual and had the fourth-largest area measured since the start of the satellite record in 1979.

Giant crack opens up in Wyoming

Not a danger to humans ... just a cool example of nature's power. The Crack, as locals call it, is now hundreds of yards (meters) long and still growing.