As people become more aware of the problems caused by plastic pollution, governments and businesses are focusing more and more on ways to reduce "single-use" plastics.
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."
The World Chess Championships are tied after 12 games, and will be decided on Wednesday with short, fast games. The Women's World Chess Championships ended last Friday, also with tie-breaking speed chess.
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.
For over a week, people have been protesting in France, blocking roads while wearing yellow yellow vests. Yesterday, the protests became more violent as the group targeted the nation's capital, Paris.
On Monday, NASA will land its InSight spacecraft on Mars. The landing will be difficult, but if all goes well, InSight will send back important information about the inside of Mars.
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.
Last Thursday, high school students in Korea took an eight hour test that could change the rest of their lives. The whole country stops to focus on this test.
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.