CARL AZUZ, CNN 10 ANCHOR:  Hey.  I`m Carl Azuz.  Thanks for watching CNN 10.
We`re  back to our daily coverage of explaining international events today.   It starts with an American leader`s visit to a place that`s still 
technically at war.
No  peace treaty has ever been signed on the Korean peninsula, though an  armistice formally stopped the fighting and the conflict in 1953.  The  U.S. 
fought in the war.  It`s now an ally of South Korea.   Yesterday, U.S. Vice President Mike Pence visited the demilitarized  zone, the DMZ, the border 
line that divides North and South Korea.
Standing  less than 100 feet from North Korean soldiers, the vice president said  the Trump administration would have a different approach to North 
Korea than previous administrations did.
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MIKE  PENCE, VICE PRESIDENT OF THE UNITED STATES:  They`re going to abandon  the failed policy of strategic patience, but we`re going to redouble our  
efforts to bring diplomatic and economic pressure to bear on  North Korea.  Our hope is that we can resolve this issue peaceably.
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AZUZ:   To do that, the U.S. is relying heavily in North Korea`s main ally,  China, to pressure North Korea to give up its controversial nuclear 
program.
So  far, the North has indicated it won`t.  And though it tried out a  missile on Sunday, the weapon apparently blew up right after it  launched.
U.S. officials don`t think it was a long range missile  that could reach other continents, but South Korea has said that if the  North tests one of 
those, or tests a nuclear weapon again, the North would receive a powerful punishment.
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ERIN  BURNETT, CNN ANCHOR:  So, we`re going here unto the actual line to go  into North Korea and I actually have to walk this way.  We can`t shoot 
left, we can`t shoot right, w can only shoot forward.  There`s a lot of restrictions on our cameras.  
But  to get here, we had to go through three checkpoints.  We passed some  anti-tank explosives and now, we`re about to go into these blue rooms  and 
into the North Korea line.
So, the North Koreans and the South Koreans still meet in this room?
PFC. ANDREW ZELLNER, U.S. ARMY:  Yes, the last known visit was 2008.
BURNETT:   Literally these microphones in the table are what defines the line.   So, North Korea on this side, South Korea on that side.  It seems so 
easy.  It`s just one step.
But when you think about all of the militarization and what you go through and the barbed wire, it`s certainly far from easy.
This  concrete slab is literally the border.  We`re shooting it from the  Northern side.  Seventeen inches by five inches, concrete.  That`s it.  
That marks the border.  It`s been here since 1953.
And  now, the way that they passed messages, it`s pretty amazing.  They  don`t use email.  They don`t actually even use a phone.  There`s a phone  
but it rings and rings and North Koreans don`t answer it.  They actually by bullhorn communicate to the North Koreans.
When  we were inside the building, we could walk on to the North Korean side  of it.  But if I were to do that outside the building, to actually step 
over that line here, what would happen to me?
ZELLNER:   What would happen is all these soldiers here would make an attempt to  stop you.  Especially me, and if once you get over there, 
there`s some -- no longer -- we can longer help you.  With an -- 
BURNETT:  What do the North Koreans do?
ZELLNER:  Probably go down there and grab you.
BURNETT:   For the South Korean soldiers, this is the most prestigious assignment  there is, to serve here in the DMZ, they have to be at least 
five feet nine inches tall, which is taller than average, and every single one of them has a black belt in taekwondo.
So,  North Koreans and South Koreans stand here every single day and stare  at each other.  The South Korean soldiers are right behind me, and then  you 
can see that concrete building.  That`s where North Korean  tourists can come to visit the DMZ, and apparently a lot of Chinese  actually come 
through the North Korean side as a well.  
And  then there`s that soldier.  He stands there every single day.  But the  South Koreans and the Americans don`t know his name.  So, they just  refer 
to him as "Bob".
So, we`re basically surrounded by North Korea now, right?
ZELLNER:  Yes.  To give you a little idea of that, all this tree line and around that road and back is all North Korea.
BURNETT:   So, it`s all North Korean and where we are sort of -- I mean, one  little safe spot.  But this is all mined as well, right?
ZELLNER:  Yes.  There`s approximately, I`m assuming a thousand mines within this area alone.
BURNETT:   Amidst the minefields is a bridge and North Korea is on the other  side.  There`s actually a cement wall to prevent defectors from coming  over 
to the South.  It`s called the Bridge of No Return.  And 62 years after the ceasefire, it`s still a lonely place.
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BURNETT:   Voters in Turkey have decided to change their Constitution, to shift  their government type from a parliamentary system to a presidential 
one.
Sunday`s  vote was close.  Just over 51 percent in favor of the changes, to a  little more than 48 percent opposed.  International officials who are 
monitoring the election said it took place on a, quote, "unlevel  playing field" and that it fell short of a truly Democratic vote.  
Turkey`s  government said the monitors` findings reflected a, quote, "biased and  prejudice approach" and that they were unacceptable.
The results  will increase the power of Turkey`s current leader, Recep Tayyip  Erdogan, and they could allow him to serve as the nation`s president 
until 2029.
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AZUZ (voice-over):  Ten-second trivia:
When and where was the first organized marathon held?
1970 in New York, 1897 in Boston, 1896 in Athens, or 1976 in Paris?
Though it commemorates an event that took place in 490 B.C., the first organized marathon was run in Athens in 1896.
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AZUZ:  The second oldest marathon on that list was run in 1897 in Boston.  Fifteen runners started, 10 finished. 
In  yesterday`s race, the 121st Boston marathon, more than 30,000 people  entered the race.  And despite relatively warm temperatures in the low  70s 
that took a toll on some runners, Kenya`s Geoffrey Kirui  won the men`s division race in two hours, nine minutes, 37 seconds.   Kenya`s Edna 
Kiplagat won the women`s division race in two  hours, 21 minutes, 52 seconds.  It was the first time either had run the  Boston marathon.
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DR. SANJAY GUPTA,  CNN CHIEF MEDICAL CORRESPONDENT:  One of the most iconic records was the  four-minute mile, first achieved in 1954 by British medical 
student Roger Bannister.
Running  at a speed of 15 miles per hour, Bannister did what many considered  impossible, suggesting the barrier wasn`t just physical, but  psychological.  
And after years of failed attempts, his record was beaten, just a few weeks later.
Since  that miracle mile, runners have continued to chase records over longer  and longer distances.  In particular, 26 miles and 385 yards, better 
known to you and me as a marathon.
Today, the time set in 2003 by English runner Paula Radcliffe remains unbroken.  
But  it`s a different story for male competitors.  In the past decade alone,  the men`s world record has been broken five times, dropping by one and a  
half minutes.  The record of two hours, two minutes, 57  seconds is held by Kenyan Dennis Kimetto, after his remarkable run at  the Berlin marathon in 
2014.  
But now, a different race is underway to reach beyond what many are calling running`s last frontier, the Sub 2 Hour marathon.
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AZUZ:   As an alternative energy source, solar power shows some promise and  that it`s renewable, it`s sustainable, it can reduce electricity cost.   But 
it faces a lot of hurdles.  For one thing, different parts  of the world get different amounts of sunlight.  Not everywhere gets  enough for solar 
energy, making the actual solar panels can be  expensive and cause significant pollution, and once they are made they  take up a lot of space, 
more than what`s available in some places.
Still part of Hawaii is finding a way to make them work.
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DAVID  BISSELL, CEO, KAUAUI ISLAND UTILITY COOPERATIVE:  This is the first and  biggest combined battery and photovoltaic system in the world.  This 
project creates energy during the daytime to power up the 4,500 houses on quiet name.
STEPHANIE ELAM, CNN CORRESPONDENT (voice-over):  Solar power is not new, but storing this much energy from the sun is.
The  project commissioned by Kauai Island Utility Cooperative is owned by  Tesla.  On about 50 acres of former sugarcane farmland, some 5,500  panels 
now stand, soaking up the sun`s power during the day to  store in these Tesla batteries before feeding that energy to the entire  island grid during 
peak hours in the evening.
BISSELL:  Every day, these batteries will store enough power that they could drive a Tesla car 150,000 miles.
ELAM:   One obvious benefit, less reliance on fossil fuels.  The price of gas  and oil can fluctuate.  But the cost of this system will remain stable 
for the term of the utility`s 20-year contract with Tesla.
(on camera):  It`s expensive to get fossil fuels here.  
BISSELL:   It is very expensive.  We`re saving ten million gallons of fossil fuel  a year with these projects.  This project alone (INAUDIBLE) this place 
about 1.3 million gallons of diesel.  
MICHAEL  YAMANE, COO, KAUAI ISLAND UTILITY COOPERATIVE:  I think this is the  grid of the future.  On reliability stand point, it`s adding a lot of 
value.  No additional cost.
ELAM:  Solar and the batteries, is that enough to power the island on its own all the time?
YAMANE:  We still need to run some conventional generation.  But hopefully with other projects coming, they just lower them all.
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AZUZ:   California`s wet winter didn`t only bring relief to the state to  historic drought, it brought on a super bloom of wildflowers.  This is 
being characterized as an explosion of vibrant color, an ocean of  yellow at Carrizo Plain National Monument.  A woman recorded this from  her drone 
while she was camping.  The wildflowers typically  bloom in spring.  April and May are usually the best months for seeing  them before the hotter 
summer months dry them.
Until  then, they`ve got some serious flower power.  And if you got cyme to  check them out, you`ll find they`ll brilliant to their corymb.  They`ve 
been raceme to bloom.  With the petal to the metal, there`s been a  spike in vibrancy.  You can say they`ve reached the panicle of beauty.  
Flower puns always in bloom on CNN 10.  I`m Carl Azuz.