0:00:02 > 0:00:05Hi, I'm Leah, this is Newsround and here's what's coming
0:00:05 > 0:00:07up on the show today:
0:00:07 > 0:00:10How birds could teach drones to fly.
0:00:10 > 0:00:13And find out what Pokemon burgers look like.
0:00:13 > 0:00:17This is Newsround.
0:00:22 > 0:00:28So our top story this Tuesday - air pollution in cities hasn't
0:00:28 > 0:00:28improved enough over the last 20 years.
0:00:31 > 0:00:33A new report by the Royal Geographical Society says
0:00:33 > 0:00:36pollution caused by cars, buses and lorries makes the air
0:00:36 > 0:00:39in some cities bad enough that it could make some people ill.
0:00:39 > 0:00:41The Government says it's trying to reduce air pollution
0:00:41 > 0:00:45but experts say more needs to be done to encourage people
0:00:45 > 0:00:48to walk or cycle.
0:00:48 > 0:00:51Now, ever wondered how birds manage to fly in even the strongest winds?
0:00:51 > 0:00:55Well, a team of scientists in the US has created a special wind tunnel
0:00:55 > 0:00:56to help them find out.
0:00:56 > 0:01:02BBC science reporter Victoria Gill went to see it.
0:01:02 > 0:01:05Filmed in super-slow motion.
0:01:05 > 0:01:09Scientists have a lot to learn from this little lovebird.
0:01:09 > 0:01:11How such tiny birds fly smoothly through gusty air
0:01:11 > 0:01:17is still a mystery.
0:01:17 > 0:01:20So scientists at Stanford University have built this.
0:01:20 > 0:01:23It is a wind tunnel for birds.
0:01:23 > 0:01:25We worked for four years to design this
0:01:25 > 0:01:28and build this.
0:01:28 > 0:01:31It was put together specifically to study how birds fly.
0:01:31 > 0:01:33We can use the best possible techniques.
0:01:33 > 0:01:37Those techniques include cameras that film in extreme slow motion,
0:01:37 > 0:01:43capturing tiny wing adjustments that keep the birds steady in the wind.
0:01:43 > 0:01:47It is the latest ambitious experiment in a lab here in
0:01:47 > 0:01:51California that is dedicated to unravelling the secrets of flight.
0:01:51 > 0:01:53Diana works with these birds every day.
0:01:53 > 0:01:55She uses clicker training and food rewards
0:01:55 > 0:02:00so they will fly to wherever she points her finger.
0:02:00 > 0:02:05The ultimate aim is the design of tiny flying robots like these.
0:02:05 > 0:02:08By copying what birds do, engineers can build
0:02:08 > 0:02:10much smaller, steadier robots that they could then send out
0:02:10 > 0:02:15after a disaster to search for people who might be trapped.
0:02:15 > 0:02:17So these scientists will aim to create robotic copies
0:02:17 > 0:02:23of what nature has perfected over millions of years.
0:02:23 > 0:02:25Sport now, and Manchester United's Wayne Rooney will stay
0:02:25 > 0:02:27on as captain for England.
0:02:27 > 0:02:31New England manager Sam Allardyce says it was an "easy decision"
0:02:31 > 0:02:34because he's "hugely respected".
0:02:34 > 0:02:37And Big Sam's number one goalie, Joe Hart, has moved a step closer
0:02:37 > 0:02:39to joining Italian side Torino on loan for a season.
0:02:39 > 0:02:44He's fallen out of favour at Manchester City and he's
0:02:44 > 0:02:48due to have a medical in Italy later today.
0:02:48 > 0:02:51Now to the incredible Australian teenager whose become the youngest
0:02:51 > 0:02:54person ever to fly by himself around the world in a single engine
0:02:54 > 0:02:59aircraft and this how he did it.
0:02:59 > 0:03:0454 days after taking off, Lachlan Smart arrived back home.
0:03:04 > 0:03:07Crowds of people welcomed him at the airport
0:03:07 > 0:03:12on the Sunshine Coast, eastern Australia.
0:03:12 > 0:03:16It was from here on July 4th that the 18-year-old took off
0:03:16 > 0:03:18in his single-engine aircraft.
0:03:18 > 0:03:21And he now returns home a world record breaker,
0:03:21 > 0:03:28almost a year younger than the previous record holder.
0:03:28 > 0:03:32It's so amazing to finally be back here in my home town
0:03:32 > 0:03:35in the Sunshine Coast and landing back on the runway
0:03:35 > 0:03:37that I did my initial flight training on was just very special.
0:03:37 > 0:03:40Lachlan travelled more than 24,000 air miles and stopped
0:03:40 > 0:03:44at 24 different airfields around the world.
0:03:44 > 0:03:48Starting on the Sunshine Coast in Australia, his first stop
0:03:48 > 0:03:50was the island of Fiji.
0:03:50 > 0:03:54He then made stops in the US, Canada and Europe, where he took
0:03:54 > 0:03:58a week's break and visited family in London.
0:03:58 > 0:04:02He continued his journey on to North Africa, the Middle East
0:04:02 > 0:04:05and through to South East Asia, where he had some
0:04:05 > 0:04:08communication problems.
0:04:08 > 0:04:12But undefeated, he carried on his journey back home to Australia.
0:04:12 > 0:04:15As well as breaking the record, he hopes his epic journey gets
0:04:15 > 0:04:18other people motivated.
0:04:18 > 0:04:21When we are told we are too young, you are not good enough,
0:04:21 > 0:04:25it's too hard, when with enough hard work you can get there and hopefully
0:04:25 > 0:04:27I've started to prove that as an 18-year-old.
0:04:27 > 0:04:29Two and a half years planning this trip around the world
0:04:29 > 0:04:31and now having completed it.
0:04:31 > 0:04:33After many hours of hard work, I'm trying
0:04:33 > 0:04:36to prove the sky is not the limit so, yeah, dream big.
0:04:36 > 0:04:39And finally, yes, it's breakfast but we promised you this one
0:04:39 > 0:04:40at the top.
0:04:40 > 0:04:42This is what Pokemon burgers look like.
0:04:42 > 0:04:45A restaurant in Sydney, Australia cooked up the creations.
0:04:45 > 0:04:48Look, that's Pikachu.
0:04:48 > 0:04:51There are also veggie options and it got lots of fans excited -
0:04:51 > 0:04:53there were queues around the block.
0:04:53 > 0:04:54That's all from me.
0:04:54 > 0:05:00Newsround's back right here in about half an hour.