30/04/2014 Newsround

Hey, Martin here with your final update of the morning. Coming up...

The truth behind why you and your siblings are so different.

Plus, the power to control your TV, tablet or phone at your fingertips.

This is Newsround. But first to a sporting row over

whether a new British athletics record should be allowed to stand.

Olympic champion Greg Rutherford recently set a new British best in

the long jump at an event in America. But rival Chris Tomlinson -

who previously jointly held the record - says it shouldn't count. He

claims Greg's foot was over the line and the jump was actually a foul.

The judges say it was fair but Chris wants it looked at.

It is not a legitimate jump. If we are going to accept these marks, we

are British athletics and we have to set an example. We have to be above

all this. These records have to be proper national records set

legitimately. Now, how different are you from your brother or sister?

It's a question you might have asked yourself and a new study says there

might be more between you than you'd think. And it's all based on when

you were born. Here's Leah with more.

Whether you are first-born, middle child or the youngest, how you

perform make me down to what position you are in your family. A

study suggests first-born children are more ambitious when it comes to

studying and going to university. But it also found that there was no

difference between middle and youngest children. We thought we

would ask you what you think of your siblings. If you need help with your

home work then there is someone to help you out. You are the eldest, do

you think you are smarter than your sister? I think I am because she

doesn't work as hard as me. I think it is just a stereotype. Who is

better at studying? You or your sister? My sister. Everyone is

different. Not everyone is the same. One of the possible reasons is --

could be down to mum and dad. Parents spend more time together

with the first child because they are the only child at that moment.

But whether you are first-born or not one thing never changes, sibling

rivalry. I work harder than my sister.

To other news from around the world now and a new study that claims some

of the globe's biggest cities are sinking. In some mega-cities close

to the sea, scientists say the ground is going down ten times

faster than the water is rising. The research, which was presented by

leading European scientists showed examples from Japan, Thailand and

Indonesia. They say more needs to be done to stop it.

To the latest in wearable technology next and the power to control all

your gadgets using just one finger. Well, well sort of. This is the Nod,

a high-tech ring that can be used to write air messages, read books on a

big screen, send texts and even control your TV. It'll set you back

almost ?90 but the man behind it is pretty excited about what it can do.

Nod enables you to enact with anything around you. We have a

slider. You can slide your visitation or your music. You can

play, pause, change the volume or channel. Next to the space satellite

found in the middle of a rainforest.

A fisherman in Brazil's Amazon region has found a large piece of

debris from a European space launch. The man said he found the metal

object floating on a remote river. It's believed to be debris from a

launch in a neighbouring country last summer. And you can see a

special picture gallery of how that satellite was discovered over on the

Newsround website right now. That's also where you can check out news on

the latest Xbox launch and the details of the cast for the new trio

of Star Wars movies. And finally, how do you go surfing

when you've got no waves? Make your own of course. American surfer

Garrett McNamara had a go at riding these artificial waves in Portugal.

They were generated using a special