0:00:00 > 0:00:01See ya.
0:00:01 > 0:00:02See ya.
0:00:11 > 0:00:14Hi, I'm Ayshah and this is Newsround.
0:00:14 > 0:00:16First up, a BBC investigation has shown there are problems
0:00:16 > 0:00:18with the way YouTube deals with upsetting comments
0:00:18 > 0:00:22aimed at children.
0:00:22 > 0:00:25The people who monitor and report these comments say they're worried
0:00:25 > 0:00:30that they are not being removed, even after they have been reported.
0:00:30 > 0:00:33YouTube say they remove most of thes upsetting comments within 24 hours,
0:00:33 > 0:00:38but children's charity the NSPCC say they want more to do be
0:00:38 > 0:00:43done by the Government.
0:00:43 > 0:00:45And the company.
0:00:45 > 0:00:49And don't forget for help and advice on this you can head to the website
0:00:49 > 0:00:50and check out our staying safe online guide.
0:00:50 > 0:00:52It's Black Friday today!
0:00:52 > 0:00:53So what's that?
0:00:53 > 0:00:55It's when adults spends loads of money on big sales.
0:00:55 > 0:00:59It's something that started in America and then came here.
0:00:59 > 0:01:02People in the UK are expected to spend over £1 billion - let's
0:01:02 > 0:01:06hope there's some Christmas pressies in there!
0:01:06 > 0:01:08Now, if you've ever watched Star Wars you might be familiar
0:01:08 > 0:01:10with warp speed technology, which allows people to travel
0:01:10 > 0:01:14through space at super-fast speeds.
0:01:14 > 0:01:16-- if you've ever watched Star Trek.
0:01:16 > 0:01:19In this week's Big Question Oliver asked how far away are we from
0:01:19 > 0:01:21making this technology in real life?
0:01:21 > 0:01:24So who better to answer it than a Nasa jet propulsion expert?!
0:01:38 > 0:01:40Well, right now it's impossible for us to move at warp
0:01:40 > 0:01:42speed through space.
0:01:42 > 0:01:45We've thought about ways of trying to do that,
0:01:45 > 0:01:48but there is nothing that is practical at this point.
0:01:48 > 0:01:51For example, right now our fastest spaceships can travel
0:01:51 > 0:01:54at about 25,000 miles an hour.
0:01:54 > 0:01:57With the speed of light, we can travel at about
0:01:57 > 0:01:59186,000 miles a second.
0:01:59 > 0:02:02If we could travel at that speed, that would take us a second
0:02:02 > 0:02:05and a quarter to get to the moon.
0:02:05 > 0:02:07Right now, with our fastest ships, we can take about three
0:02:07 > 0:02:10days to get to the moon.
0:02:10 > 0:02:14So, well, really, really slow in comparison to the speed of light.
0:02:14 > 0:02:17Now, we've also computed how much energy it takes for a spaceship
0:02:17 > 0:02:22to go at about a tenth of the speed of light, and that is about between
0:02:22 > 0:02:29five and 100 times the total world energy output.
0:02:29 > 0:02:32So, wow, all that energy, so much, and we just don't
0:02:32 > 0:02:35have that on the earth.
0:02:35 > 0:02:38So we're going to have to find some new fantastic way of creating that
0:02:38 > 0:02:41energy before we can even think about going near the speed of light,
0:02:41 > 0:02:46let alone going at warp speed.
0:02:56 > 0:03:00Mooli... We will be answering one of your big questions every Thursday,
0:03:00 > 0:03:03so if you have something to as, go online now.
0:03:03 > 0:03:05Next meet the world's best teacher!
0:03:05 > 0:03:07Maggie MacDonnell from Canada won this year's famous
0:03:07 > 0:03:08Global Teacher Prize.
0:03:08 > 0:03:10She teaches at a school in the Arctic Circle,
0:03:10 > 0:03:12where the children walk for miles through snow and freezing
0:03:12 > 0:03:15temperatures just to get to class.
0:03:17 > 0:03:20Everyday when my students come to school and they come
0:03:20 > 0:03:23in my classroom, I thank them for getting there that day.
0:03:23 > 0:03:25Because I know they've run a marathon sometimes,
0:03:25 > 0:03:28they've run over all sorts of obstacles just to get
0:03:28 > 0:03:30to the classroom door.
0:03:30 > 0:03:36My name is Maggie MacDonnell and I teach in the Arctic.
0:03:37 > 0:03:40As a teacher in the Arctic, the definition of a teacher
0:03:40 > 0:03:43there is very, very broad.
0:03:43 > 0:03:46We are not only instructing lessons in the classroom,
0:03:46 > 0:03:49but you really have to engage with your students
0:03:49 > 0:03:52outside of the classroom.
0:03:52 > 0:03:55You have to make the class and school welcoming to them.
0:03:55 > 0:03:57They have to see you in the community.
0:03:57 > 0:04:00Often you take on roles such as a social worker or a counsellor
0:04:00 > 0:04:05or maybe even a family friend.
0:04:05 > 0:04:09I think that if a student from the UK or India
0:04:09 > 0:04:12were to drop into my classroom, the one thing that they may be
0:04:12 > 0:04:16surprised about is that not every classroom has four walls.
0:04:16 > 0:04:20And as much as possible I try to take my students outside
0:04:20 > 0:04:24of the traditional school and into the community where we can
0:04:24 > 0:04:27do project-based learning, authentic learning, and I think
0:04:27 > 0:04:30that's what's really powerful about the style of teaching that
0:04:30 > 0:04:33I've been working on.
0:04:33 > 0:04:35As much as possible I love integrating my students
0:04:35 > 0:04:40into the community, creating opportunities for them to offer
0:04:40 > 0:04:42community service and basically create opportunities for my students
0:04:42 > 0:04:44to see themselves not as problems but as agents
0:04:44 > 0:04:53of change in their community.
0:04:53 > 0:04:56That's all from me, we'll be back in half an hour.
0:04:56 > 0:04:58Bye.