What are the threats for kids online? Official advice on internet safety tends to focus on a few main threats. In late 2015, the UK government published measures to keep children safe online at school and at home. It includes "cyber bullying, pornography and the risk of radicalization" as major threats. It refers to "some school children, who travelled or attempted to travel to Syria, were able to access material about Daesh ["Islamic State" or ISIS] and foreign fighters via school computers."

The UN's Food and Agriculture Organization (FAO) is holding a meeting in Harare on how to stop the spreading infestation of the "fall armyworm." The caterpillar has already caused damage to staple crops in Zambia, Zimbabwe, South Africa and Ghana. There are reports that Malawi, Mozambique and Namibia are also affected.

My daughter keeps asking why the dinosaurs died, and I've been telling her that an asteroid hit the Earth and threw a lot of dust into the air, and that's why the plants couldn't grow anymore so the dinosaurs got hungry and went to sleep and never woke up. (She's four). But that's not exactly right, is it? During the last few years, some research has shown that there was not that much dust, or dust of the right size, that was thrown into the air. But there was sulfur. And then the sulfur in the atmosphere developed into sulfur aerosols. And they can cool down the Earth and block the light.

Silicon Valley is struggling for its life on the issue of immigration. Over 100 tech firms, including Google, Facebook and Apple, have joined the legal battle against President Donald Trump's executive order temporarily barring entry to nationals from seven predominantly Muslim countries.

Authorities ordered the evacuation of low-lying areas of Oroville, Yuba and other towns downstream from Oroville Dam on Sunday, citing a "hazardous situation" at the tallest dam in the US. According to US Census data, over 160,000 people live in the area.

Deutsche Welle: As the first new German astronaut after Alexander Gerst there are going to be comparisons, and even here today (2.2.2017) at the European Space Operations Centre in Darmstadt, you were almost introduced as Gerst. How are you going to jump that shadow? What do you bring to the table? Matthias Maurer: Well, you said it: Alexander Gerst is very well known in Germany - he's famous here. That's because he did an outstanding job. He flew the 2014 Blue Dot mission. And next year he flies again and then it'll be as commander of the International Space Station (ISS). So I believe he did an outstanding job, and I want to follow his example. But I also want to try to find my own profile. And what would that profile be? Would it be in the science you do?

Social giant Facebook has released a new networking feature on its mobile Android and iOS apps, designed to facilitate connections between people who aren't already Facebook friends.

The race to space between East and West was in full swing on August 26 1978, when East-German Sigmund Jähn took off on board of space ship Soyuz 31 to the Soviet space station Saljut 6. Some time had passed since Yuri Gagarin flew to space as the first man in 1961 - an achievement countered by US space agency NASA with a total of five moon landings between 1969 and 1972. Now, a new phase in the world's space competition was about to begin: The Soviet Union's socialist fraternal countries were invited to send their own cosmonauts into space - long before the US opened its own space program to its allies.

This could be a special year for human spaceflight. Europe and the US are collaborating and progressing with the Orion spacecraft, and next week, SpaceX inaugurates a revamped launch site in part for human cargo. To call it a space race at this stage would be odd, not to mention misleading. What we're seeing now is more like a sprint, or a dash, where all the competitors are holding hands to the finish.

Yelling, corporal punishment or verbal threats of physical consequences, or "harsh parenting," as it was defined in a new long-term study, causes children to perform poorly in school and to behave badly outside of it. According to researchers at the University of Pittsburgh in the US state of Pennsylvania, children raised in a severe parental environment are more likely to skip homework to play with friends and more willing to break rules in order to maintain those friendships - at the consequence of academic performance.

Data-Guru Hans Rosling died on February 7, 2017. His organization Gapminder sent out a tweet with the information late Tuesday evening Swedish time. Rosling was a scientist who made an art form out of explaining the world to us while never losing his hope for humanity.

At a Vatican conference on organ trafficking, China's top official on transplantation said on Tuesday that the country was working on improving the way it handled organ transplants. "China is mending its ways and constantly improving its national organ donation and transplantation systems," said Dr. Huang Jiefu, the director of China's transplant program.

DW: Have you ever been bitten by a shark? Erich Ritter: Yes, I have - several times. One of these accidents was a bit worse than the others. But most of the time, I experienced only harmless nips, which didn't even bleed much. Why do accidents with sharks happen? Eighty to 90 percent of all bites are only the shark's way of checking out what we are. It takes, for example, a hand into its mouth and presses it shut only slightly. The really bad wounds originate when you try to pull out your hand from the shark's mouth.

Life under the new US president isn't easy for scientists and science reporters. Donald Trump is a denier of man-made climate change and has called global warming a Chinese-propagated myth. He has ordered the Environmental Protection Agency (EPA) and the departments of the Interior, Agriculture, and Health and Human Services not to send out any press releases or update their website content for the time being. And he banned the National Parks Service from tweeting.

Social media companies Facebook, Google and a group of news organizations launched an initiative dubbed "Cross Check" on Monday to tackle fake news stories in France, with the media in the spotlight as the country's presidential election approaches.

One-year-old stray Pooh is back on all fours after groundbreaking surgery carried out for the first time in continental Europe. The black-and-white feline is thought to have lost his hind legs in a mishap involving either a car or train in April last year. Pooh and another cat, Stiven, were taken to Sofia's Central Vet Clinic by the animal charity Let's Adopt Bulgaria.

According to a report in the Wall Street Journal, Facebook is currently working on an app for streaming TV boxes (such as Apple TV). It's thought that the social network could use it to deliver exclusive content.

Recent images from the European Space Agency's Mars Express satellite offer a new perspective to the ice cap on the planet's north pole. Using 32 separate shots collected over a six-year period, the images show dark, spiraling troughs cutting up a million square kilometers of ice-covered terrain.

As the first new German astronaut after Alexander Gerst there are going to be comparisons, and even here today (2.2.2017) at the European Space Operations Centre in Darmstadt, you were almost introduced as Gerst. How are you going to jump that shadow? What do you bring to the table? Matthias Maurer: Well, you said it: Alexander Gerst is very well known in Germany - he's famous here. That's because he did an outstanding job. He flew the 2014 Blue Dot mission. And next year he flies again and then it'll be as commander of the International Space Station (ISS). So I believe he did an outstanding job, and I want to follow his example. But I also want to try to find my own profile.

Going in search of people who will speak on the record about artificial sweeteners like Aspartame at a sweets fair is like going to a tobacco convention to talk about cancer. Everyone can see the elephant in the room but no one wants to chew it. And there's a palpable sense of anxiety. No one wants to say the wrong thing.