:00:00. > :00:10.You're in the right place for all of Thursday's top stories. I'm Ricky
:00:11. > :00:13.with some of this. I have been finding out why violence
:00:14. > :00:16.in Brazil is causing problems with the World Cup just weeks
:00:17. > :00:24.And one of the world's most iconic puzzles celebrates a big birthday.
:00:25. > :00:28.This is Newsround. First to Brazil and the city of Rio de Janeiro. It's
:00:29. > :00:33.one of the locations for this summer's World Cup, as well as the
:00:34. > :00:36.host city for the next Olympics. But this week has seen violent clashes
:00:37. > :00:40.there, close to a popular tourist spot. It's the latest in a long line
:00:41. > :00:43.of problems to hit Brazil, with the world's biggest football tournament
:00:44. > :00:48.just weeks away. Martin's got more. It's just a month to go until the
:00:49. > :00:51.world cup starts and these are the pictures the world is seeing of
:00:52. > :00:56.Brazil. Violence broke out in a poor area close to Rio's famous beaches.
:00:57. > :01:00.Barricades were set up and tyres lit on fire. The violence started
:01:01. > :01:04.because local people believed that the police had killed an innocent
:01:05. > :01:08.man. The area is a neighbourhood known as a favela, or a slum, where
:01:09. > :01:11.poor people live. There are many favelas in Brazil's big cities and
:01:12. > :01:16.they often have huge problems with crime. This latest violence is a
:01:17. > :01:20.real worry because it's happening close to the big tourist areas in
:01:21. > :01:23.the city. But so far, there's been no risk to visitors coming to the
:01:24. > :01:28.country. Brazil's famous for its love of football, but it also has a
:01:29. > :01:31.lot of crime and poverty. The government has been trying to
:01:32. > :01:34.improve things ahead of the World Cup by sending armed police into the
:01:35. > :01:39.favelas to try drive out the criminals. The problem is it just
:01:40. > :01:44.seems to have moved the trouble to other areas. Brazil was awarded the
:01:45. > :01:51.World Cup seven years ago, and it promised to tackle the crime
:01:52. > :01:56.problems. But the crime's so widespread, it's a massive task.
:01:57. > :01:59.There have also been issues with stadiums not being ready and huge
:02:00. > :02:03.protests about how much public money it's all costing, money that some
:02:04. > :02:09.say could be going to help poor people in the country. With just a
:02:10. > :02:13.few weeks to go before the best players on the planet compete for
:02:14. > :02:19.this trophy, Brazil's got a big job on its hands to convince the world
:02:20. > :02:23.it's ready. Next, we're talking hedgehogs. Once
:02:24. > :02:26.a big part of British wildlife in years past, now they're listed as an
:02:27. > :02:30.endangered species. But a new study has found that in some areas,
:02:31. > :02:32.they're on the rise because of the controversial badger cull trial.
:02:33. > :02:39.Here's Leah. They're cute, small and seriously
:02:40. > :02:43.spiky. But across the UK, the number of hedgehogs has been going down for
:02:44. > :02:47.years. One reason for this is thought to be that the areas where
:02:48. > :02:53.they live have been built on or used for farming crops. But another
:02:54. > :02:57.threat is the badger. They both compete for the same food, a mix of
:02:58. > :03:03.slugs and worms, meaning the bigger animal wins. And in the wild badgers
:03:04. > :03:05.will often eat hedgehogs, too. Now, researchers from Exeter and
:03:06. > :03:08.Southampton University have found in the areas where badger culls are
:03:09. > :03:19.taking place, numbers of hedgehogs have more than doubled. We also saw
:03:20. > :03:25.from the same surveys that when you remove badgers, you ended up with
:03:26. > :03:29.more foxes around and that could have a negative effect on other
:03:30. > :03:35.wildlife. The key point is when you manage wildlife in an intensive way,
:03:36. > :03:40.you can end up with a whole host of unexpected and complex outcomes for
:03:41. > :03:43.other species. We need to think carefully before we undertake
:03:44. > :03:47.large-scale wildlife management such as this. The research was funded by
:03:48. > :03:50.the government department for environment, food and rural affairs,
:03:51. > :03:53.who are behind the badger cull. And not everyone agrees with it. So
:03:54. > :03:57.while numbers are on the up where the cull is taking place, in other
:03:58. > :03:59.parts of the country hedgehogs are struggling. Conservationists are
:04:00. > :04:04.warning unless action is taken these spiky creatures may not be with us
:04:05. > :04:08.for much longer. It's one of the bestselling toys of
:04:09. > :04:11.all time and today it celebrates 40 years of frustrating and puzzling
:04:12. > :04:15.millions of people. The Rubik Cube first started life in 1974 and was
:04:16. > :04:19.originally called The Magic Cube. More than 350 million have been sold
:04:20. > :04:24.worldwide and this new exhibition showcasing 40 years of its history
:04:25. > :04:27.is opening in the US. Our website's the place to see some
:04:28. > :04:31.video of a very speedy solving of the cube, as well as find out some
:04:32. > :04:34.fascinating Rubik's cube facts! Last up, manatee news. Four of the
:04:35. > :04:37.creatures rescued from illegal wildlife traders have been released
:04:38. > :04:40.back into the wild in Peru, in South America. Manatees, which are also
:04:41. > :04:44.known as sea-cows, are an endangered species so this was part of a
:04:45. > :04:47.conservation effort to help the creatures. The animals were very
:04:48. > :04:50.young when they were rescued so they have been raised in captivity but
:04:51. > :04:56.this was the moment they tasted freedom once again.
:04:57. > :04:59.That's all from me, Newsround's back just before seven. See ya!