The enigmatic "cenotes" of Mexico's Yucatán peninsula
Some of these sinkholes may have been formed by the impact of a meteorite around 65 million years ago. Here are the "cenotes" of Mexico's Yucatán peninsula.
The story of the Aral Sea’s disappearance
3 techniques to find your way in the woods
Could "smokers" be the origin of life on Earth?
Drugs and pesticides: a pollution invisible to the naked eye
These people joined the "fertile disobedience" movement to protect nature
This is one of the most invasive aquatic plants in the world