02/08/2016 Newsround

Leah here with your top stories this Tuesday morning.

Thousands of flies take over this bridge...

And the boy who's travelling to every London Underground station.

He's one of the most famous faces of Team GB.

With the Rio Games just three days away, Tom Daley has

just landed in Brazil - a moment he's been working

Hi, I'm Tom Daley and over the last eight years I've been working

as hard as I possibly can to make my third Olympic

I started back in 2008 in Beijing, when I qualified when I was 13

years old and managed to compete when I was 14.

Then in 2009, I won the World Championships,

and ever since I got a taste of being on top of the world I've

always wanted to win an Olympic gold medal.

Then, in London 2012, it was the home Olympics

and it was the most exciting thing ever.

There was 18,000 people coming to support me.

My friends, my family, millions watching at home,

so there was a lot of pressure, and to come away with an Olympic

bronze medal is something I've always, always dreamed of.

To win an Olympic medal and go to the Olympics in front of a home

crowd is something that's so hard to put into words.

Then after that, 2013 was one of my toughest years of diving.

I was injured with a bad tricep, my back two and a half somersaults

with two and a half twists, which was one of the dives I had

to redo in the Olympic final, started to go really downhill

and I was so terrified every single time that I went to the diving pool.

But I managed to get through it, and I took a bit of time out.

I took six weeks to travel the world and do what I wanted to do

Then I came back to diving and wanted a little bit of a change

so I moved to London and I had a new coach, Jane Figueiredo,

and ever since then I haven't really looked back.

I've been working as hard as I possibly can -

in the weight room, with my nutrition,

And then I also had to learn a new dive, which is a forward three

and a half somersaults with one twist.

It was a bit of a risk, actually, to learn a new dive so close

to the Olympic Games but I've been working on consistency.

Now, going into Rio 2016, I feel like I'm in my peak

Hopefully, going into this competition, I just want to go out

I know it's something that seems surreal to say,

but I have to believe that I can win that Olympic gold medal,

and I'm going to fight to the very end with the Chinese divers.

And if you didn't already know, there are two Olympic sports making

a comeback at the games in Rio - golf is one and the other

Team GB are fielding both a men's and women's team.

Many of the players say they're drawing inspiration from the other

Obviously it's the first time many of us have ever been

Obviously it's the first time any of us have ever been

in an Olympic Games, and we are just trying to soak it up

as much as possible but return a little bit of focus

on what it is we've got to do as well.

We are already here in the holding camp, and we are around some

of the swimmers and athletes arrived the other day so household names

are already all around us, which is hugely inspiring.

Now to the 13-year-old travelling to every London Underground

Jenny has been looking into this incredible challenge.

It's just after 10am and Ally is on a very special journey

They're trying to travel through every tube station

on the London Underground network - all 270 of them!

We have just been through the 67th station.

The day started in Chesham, way out in zone nine,

where they only had the tube driver for company!

Over ?7,000 so we have gone up a thousand in a day. Wow.

They're raising money for a cancer research charity after Ally's older

He unfortunately passed away after all the treatment in March

this year, so I decided to make sure no one else has to go through that,

Difficult but it's quite a positive thing.

We've had so much support from so many people,

all through London, people we've never met,

people who just picked up on the story, Transport for London,

It's all really feel-good in that respect.

So yes, it is hard, we wish we weren't having to do this,

but it has also been a really positive experience as well.

It was a lot of hard work but Ally made it to his final stop

Now over at Newsround online, we're asking for your reviews

The new script was released at the weekend and Poppy's already

I read Harry Potter The Cursed Child and couldn't put it down. The plot

was full of action and adventure. I liked the book because it was

written in the form of a script which makes it an easy yet

interesting read. I would rate it five stars.

These incredible pictures show hundreds of thousands of mayflies

taking over a bridge in South Eastern Poland.

They're not harmful to humans and scientists think it's proof

that the environment is clean because mayflies

Newsround is back on CBBC this afternoon at 4:20 with Ayshah.