Denmark has begun building a 43-mile (70-kilometer) fence along the border that separates it from Germany. The goal isn't to keep people out. It's to keep out a pig-like animal called a wild boar.
Published in “Science”
A huge blast of extremely cold weather has swept into the central and eastern United States from the North Pole, bringing dangerously low temperatures made worse by strong winds.
Rising temperatures are warming the oceans and causing huge amounts of ice to melt faster than expected. Unless something changes, this melting will happen even faster in the future, causing large rises in sea level.
An undersea cable that connects the island nation of Tonga to the internet has broken. As a result, Tongans will be without their main internet connection for several weeks.
On Sunday night/Monday morning, people in North and South America, as well as some parts of Europe and Africa will have a chance to see a total eclipse of a "super blood" moon.
As Australia struggles with a record-breaking heatwave, people are staying inside and finding ways to stay cool. Animals are not so lucky. Fish and bats seem to be hit the hardest.
Scientists at the University of Washington have come up with an unusual way to help farmers get information about the plants in their fields: putting sensors on the backs of bumblebees.
Every year, butterfly lovers in California go out in November to count monarch butterflies. The 2018 count had a very worrying result - monarch numbers had dropped by 86% since 2017.
The last person to spot land iguanas on the Galapagos island of Santiago was Charles Darwin - in 1835. Now they're coming back. Experts believe it will be good for both the iguanas and the island.
Grocery stores are testing different ways of delivering orders using self-driving cars. Companies are experimenting more as self-driving cars get better and the pressure from online stores like Amazon gets stronger.