The US government has come out with new advice for Americans about how much exercise they should get each week. The main message is: "Move more. Sit less."
Published in “Science”
In Stockholm, 15-year-old Greta Thunberg has been skipping school to sit outside Sweden's parliament building. She hopes her protests will force Sweden's government to focus on climate change.
If you are traveling, it's a good idea to wash your hands often - especially after you go through airport security. The plastic trays are a great way to spread illnesses.
Scientists working in Brazil have discovered a collection of termite mounds that cover an area as large as Britain. The oldest mound they tested is close to 4,000 years old.
A news company run by the government of China showed off a new tool earlier this month - a computer-created TV host to read the news on TV.
In the US, a group of 21 young people are taking the government to court, saying that the government did not work to stop climate change, even though it knew about the problem.
For over 200 years, the world has weighed things in kilograms. And for around 130 years, the weight of a kilogram has been based on one piece of metal. That is about to change.
California is battling some of the worst wildfires in its history. Dry weather and strong winds have created monster fires more deadly than anything the state has seen before.
Bill Gates is one of the world's richest men. He and his company, Microsoft, helped make computers cheap and popular. So what's he interested in now? Toilets.
The Museum of Natural History in London holds a yearly contest for the Wildlife Photographer of the Year. There is also a contest for people under 18. Here are some of this year's best pictures.
In late October, scientists controlling submarines deep under the sea came across something unusual: a huge group of around 1,000 octopuses gathered on rocks, protecting their eggs.