:00:00. > :00:07.Leah here live on CBBC with your Tuesday Newsround.
:00:08. > :00:14.Coming up: We bring you the birds that could teach drones to fly.
:00:15. > :00:16.And we'll show you what Pokemon burgers look like.
:00:17. > :00:30.So our top story this Tuesday - air pollution in cities hasn't
:00:31. > :00:35.improved enough over the last 20 years.
:00:36. > :00:37.A new report by the Royal Geographical Society says
:00:38. > :00:40.pollution caused by cars, buses and lorries makes the air
:00:41. > :00:43.in some cities bad enough that it could make some people ill.
:00:44. > :00:47.The Government says it's trying to reduce air pollution
:00:48. > :00:50.but experts say more needs to be done to encourage people
:00:51. > :01:09.The government has tried to encourage people to walk or cycle
:01:10. > :01:12.but perhaps they have not been pushing it enough.
:01:13. > :01:14.Ever wondered how birds manage to fly in
:01:15. > :01:18.Well, a team of scientists in the US has created a special wind tunnel
:01:19. > :01:21.BBC science reporter Victoria Gill went to see it.
:01:22. > :01:26.Scientists have a lot to learn from this little lovebird.
:01:27. > :01:28.How such tiny birds fly smoothly through gusty air
:01:29. > :01:39.So scientists at Stanford University have built this.
:01:40. > :01:43.We worked for four years to design this
:01:44. > :01:46.It was put together specifically to study how birds fly.
:01:47. > :01:51.We can use the best possible techniques.
:01:52. > :01:54.Those techniques include cameras that film in extreme slow motion,
:01:55. > :02:01.capturing tiny wing adjustments that keep the birds steady in the wind.
:02:02. > :02:04.It is the latest ambitious experiment in a lab here in
:02:05. > :02:08.California that is dedicated to unravelling the secrets of flight.
:02:09. > :02:10.Diana works with these birds every day.
:02:11. > :02:13.She uses clicker training and food rewards
:02:14. > :02:17.so they will fly to wherever she points her finger.
:02:18. > :02:23.The ultimate aim is the design of tiny flying robots like these.
:02:24. > :02:26.By copying what birds do, engineers can build
:02:27. > :02:29.much smaller, steadier robots that they could then send out
:02:30. > :02:33.after a disaster to search for people who might be trapped.
:02:34. > :02:36.So these scientists will aim to create robotic copies
:02:37. > :02:43.of what nature has perfected over millions of years.
:02:44. > :02:47.Sport now, and Manchester United's Wayne Rooney will stay
:02:48. > :02:52.New England manager Sam Allardyce says it was an "easy decision"
:02:53. > :02:59.And Big Sam's number one goalie, Joe Hart, has moved a step closer
:03:00. > :03:03.to joining Italian side Torino on loan for a season.
:03:04. > :03:06.He's fallen out of favour at Manchester City and he's
:03:07. > :03:10.due to have a medical in Italy later today.
:03:11. > :03:12.And thousands of people turned out for a homecoming
:03:13. > :03:16.celebration to honour Ireland's newest sporting stars.
:03:17. > :03:18.Paul and Gary O'Donovan won a silver in the rowing.
:03:19. > :03:21.They got massive cheers and said they were overwhelmed
:03:22. > :03:28.Now to the incredible Australian teenager whose become the youngest
:03:29. > :03:32.person ever to fly by himself around the world in a single engine
:03:33. > :03:43.54 days after taking off, Lachlan Smart arrived back home.
:03:44. > :03:47.Crowds of people welcomed him at the airport
:03:48. > :03:51.on the Sunshine Coast, eastern Australia.
:03:52. > :03:55.It was from here on July 4th that the 18-year-old took off
:03:56. > :04:01.And he now returns home a world record breaker,
:04:02. > :04:07.almost a year younger than the previous record holder.
:04:08. > :04:10.It's so amazing to finally be back here in my home town
:04:11. > :04:13.in the Sunshine Coast and landing back on the runway
:04:14. > :04:16.that I did my initial flight training on was just very special.
:04:17. > :04:20.Lachlan travelled more than 24,000 air miles and stopped
:04:21. > :04:25.at 24 different airfields around the world.
:04:26. > :04:28.Starting on the Sunshine Coast in Australia, his first stop
:04:29. > :04:33.He then made stops in the US, Canada and Europe, where he took
:04:34. > :04:37.a week's break and visited family in London.
:04:38. > :04:41.He continued his journey on to North Africa, the Middle East
:04:42. > :04:43.and through to South East Asia, where he had some
:04:44. > :04:49.But undefeated, he carried on his journey back home to Australia.
:04:50. > :04:54.As well as breaking the record, he hopes his epic journey gets
:04:55. > :05:01.When we are told we are too young, you are not good enough,
:05:02. > :05:04.it's too hard, when with enough hard work you can get there and hopefully
:05:05. > :05:06.I've started to prove that as an 18-year-old.
:05:07. > :05:08.Two and a half years planning this trip around the world
:05:09. > :05:13.After many hours of hard work, I'm trying
:05:14. > :05:16.to prove the sky is not the limit so, yeah, dream big.
:05:17. > :05:19.And finally, yes, it's breakfast but we promised you this one
:05:20. > :05:22.This is what Pokemon burgers look like.
:05:23. > :05:26.A restaurant in Sydney, Australia cooked up the creations.
:05:27. > :05:32.There are also veggie options and it got lots of fans excited -
:05:33. > :05:37.And there's just enough time to tell you what's happening over
:05:38. > :05:41.Check out our pics from the weekend's Notting Hill Carnival.
:05:42. > :05:44.Or if you want to exercise your brain why not have a go
:05:45. > :05:52.That's all from me and the morning team.
:05:53. > :05:57.Newsround's back with Martin at 4:20pm.