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Hi, guys, Martin here
with your Tuesday Newsround.
First up, spies, computer
hackers and Russia.
What's going on?
Well, the British Prime Minister
Theresa May has made a big speech
telling off Russia for getting
involved in other
Ayshah has more.
Do you know who this is? Mrs
Vladimir Putin and here's the
President of Russia. He likes to the
Russian people how strong he is by
riding a horse are catching big
fish. We all need a hobby. Spies
around the world are getting fed up
with what they say he is up to.
Those spies are saying that Russia
is using social media to try to
interfere in other countries
including elections. Experts believe
teams of Russian spies are writing
and spreading stories all around the
web that are made to divide people
and cause arguments. They have
thousands of social media accounts
that all shared each other's stories
so the messages go far and wide. It
is like having thousands of digital
spies. So what about Vladimir Putin?
He says he doesn't know anything
about it and if it is happening it
is nothing to do with them or Russia
but not everybody believes it and
lots of leaders want to know if
Russia is a friend but if it could
be an enemy.
Next up and it's "Arise, Sir Mo!"
Team GB Olympic hero Mo Farah went
to Buckingham Palace today
to receive his knighthood
from the Queen.
The long-distance runner
was knighted for services
for athletics and being the only man
to win the 5,000m and 10,000m gold
medal at two Olympic games.
Here at Newsround HQ
we try to answer some
of life's big questions.
So that got me thinking.
And I wanted to know "how do
you measure a mountain?"
Well guess what - smarty pants
here only went and found out!
Lets be honest,
they are pretty huge.
So, how do you measure a mountain?
I'm guessing a giant tape
measure isn't an option?
Well, there are three main
ways that scientists can
try to measure a mountain.
The first way is the traditional
way, in which it uses maths.
Yep, you heard me.
It is useful after all.
Scientists use something
which uses triangles to figure out
the height of an object.
For example, they put a point
at the top of the mountain,
at the bottom, and a point next
to it to make a triangle.
Then, by working out how big
the angles are inside the triangle,
it means they can work
out its height.
However, this method
is not super accurate.
The second way uses global
or GPS for short.
Like the maps on your phone
or sat-navs in cars.
And it is one of the most
It involves a team of scientists
hiking up a mountain carrying
a satellite receiver
device with them.
When they reach the top,
a satellite in space can
pick up the location.
However, although it is very good
at figuring out where they are,
it is not so great at figuring out
how high they are.
So the team has to stay in the exact
same spot without moving for around
several hours for the satellite
to collect all the data it needs
to figure out their heights.
But this method takes a long time.
It is a bit tricky to measure
every mountain this way,
which brings us on to...
Pretty fancy, eh?
It involves flying over a mountain
and taking lots and lots of super
high quality photographs.
These pictures can then be uploaded
to a computer which uses special
software to create a 3-D model
of the mountain.
From this, scientists can
work out its height.
This means that mountains
in harder to reach areas can
be mapped more easily.
So, after all that, we have learnt
that it is really tough work
measuring a mountain.
Now we want to hear from you.
What Big Questions would
you like us to answer?
Head online and send us an idea -
we might have a go at
trying to explain it!
That's it from me guys, Newsround's
back at 7.40 tomorrow morning.
Don't forget to head online to check
out the rest of the days stories.