13/11/2013 Newsround

Hi, I'm Ricky with all you need to know this afternoon. Coming up on

Newsround: Why scientists want to study kids to find out how they

spread the flu. Why being the tallest building is all about what

you've got on top. This is Newsround. OK, first up, we all get

coughs and colds this time of year but getting the flu can be much

worse. For the first time, scientists studying how flu gets

passed around, want to hear from the people they say are likely to be

spreading the disease the most kids! Here's Leah.

Coughing, sneezing, fever and generally feeling under the weather

- just some of the signs you could have flu. And while nearly everybody

is well again after a few days of flu for people with conditions like

diabetes, asthma or for older people it can be more serious. But go back

nearly 100 years and flu was a massive killer. In 1918 the Spanish

flu virus swept across the world. It was the most serious outbreak of a

virus ever. That's why there's been lots of focus on preventing the

spread of the flu. And scientists say the biggest spreaders of the

virus are children. Children might be less worried about washing their

hands, and throwing away their tissues. They might be more likely

to sneeze on their buddies. And that's the trouble with flu. It

passes very easily from one person to the next so if you bring it into

school chances are others will catch it too. Flu is really contagious

which means it is spread really easily and it is spread in small

drops of fluid. So while the medical experts do their bit to understand

how the flu virus gets passed between kids. Doctors are preparing

to do battle as we head into the winter - when there's most flu

around - and are giving a new type of vaccination. Good news if you

really don't like injections - there's new nasal spray version

being tried out in Scotland and parts of England - there's not a

single needle in sight. Next, international aid has finally

started arriving in the Philippines after last week's huge typhoon. A

group of UK charities said this afternoon that a special appeal to

the public has already raised ? 3 million in just over a day. The

President of the Phillipines has said the number of people killed may

not be as high as people had first thought. But bad weather and the

scale of the damage has made it very difficult to get aid to those who

have survived. Next up, what makes the tallest building - the tallest?

One World Trade Centre isn't yet finished but the decision to declare

it the tallest building in America has been a bit controversial. As

I've been finding out, it's all about what you've got on top. For

centuries, mankind has reached for the skies, searching for one goal:

to build the tallest building on Earth. The title's changed hands

plenty of times over the years. . In the space of just one year in

America's New York City, first there was The Trump Building then it was

The Chrysler building, and later the famous The Empire State building all

claimed the title of world's tallest. But in the 1990s, tower

designers discovered a little trick that would add a few cheeky metres -

a mast! Suddenly, loads of tall towers had a mast on top - to take

them that little bit higher! Taipei, Kuala Lumpur, the record was smashed

time and again. But some people said it was cheating, and a mast

shouldn't be counted in the height. It was such a heated debate - that a

team was even set up to decide whether a mast counted or not! The

catchily titled Council of Tall Buildings and Urban Habitat are the

guys who make the decision - and they've just said that the 125 metre

mast that sits here...counts! So the One World Trade Centre might not be

the tallest in the world - that s this one, Dubai's Burj Khalifa,

nearly a kilometer high - but it's beaten Chicago's Willis Tower -

whose masts DON'T count by the way - to become the tallest in

America...and it's all thanks to a little old...well big old...mast.

Last up. The slam dunk is probably the most impressive move in the

whole of basketball, right? Yep until it goes wrong. Legendary

American basketball team the Harlem Globetrotters were playing in

Honduras last week when... OUCH Don't worry! He wasn't seriously

hurt, but William 'Bull' Bullard certainly got a bit of a shock. He

got a cut on his forehead but was able to get back on his feet. He had

to sit out the rest of the match though. Lucky escape! Just time

enough to tell you about a great story on the website about a rescued

puppy that's climbed the world's highest mountain! I'm out of time,

back at 6.50. Bye.