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  • [TICKING]

  • [THEME MUSIC]

  • CARL AZUZ: On the Vernal Equinox, what's officially

  • the first day of spring in the Northern Hemisphere,

  • we're thankful you've set aside 10 minutes to watch "CNN 10."

  • I'm Carl Azuz at the CNN Center.

  • In the US Midwest, the north central part of the country,

  • there are states of emergency in Nebraska, Iowa, and Wisconsin.

  • Lots of rain plus melting snow plus a late winter snowstorm

  • brought by a bomb cyclone have left many places under water.

  • Part of the problem was that the ground was still

  • frozen when the rain came, and it wasn't

  • able to absorb the water.

  • So it found its way to rivers and streams

  • and caused them to burst their banks and spread water

  • all over.

  • On Tuesday morning, the National Weather

  • Service said more than 8 million people

  • were under flood warnings.

  • Nebraska was hit particularly hard.

  • Its governor said the flooding was

  • the most widespread disaster Nebraska had ever faced.

  • US Vice President Mike Pence traveled there

  • yesterday to survey the damage.

  • Nebraska's governor is hoping the federal government

  • will allow public funding to be used to help those affected.

  • In 17 places across the state, flood records were broken.

  • And in Iowa, 41 of the state's 99 counties

  • have been declared disaster areas.

  • In addition to at least four lives that

  • were lost in Nebraska and Iowa, farmers

  • have lost grain and livestock.

  • Fields are under water.

  • Private water supplies are threatened.

  • South of Nebraska and Iowa, the Missouri and Mississippi

  • rivers, which are already at minor or moderate flood stage,

  • are expected to rise higher in the next few days.

  • So states like Kansas, Missouri, and Illinois

  • could see more flooding in the days ahead.

  • In some places farther north, the water has begun to recede.

  • In others, the threat remains.

  • STEPHANIE ELAM: This is Winslow, Nebraska.

  • And for several days, the people who live here

  • in this small town of less than 200 people

  • couldn't even get in here to see what it looks like.

  • Now, they're able to clear away some

  • of the debris on the roadway.

  • But as you can see, look at the speed limit sign.

  • You can see how high the water still is, how high up

  • it is on these houses.

  • And every one of the houses in this town

  • are surrounded by water.

  • You could see, so many things have been pushed away,

  • toys, picnic benches, and even stairs

  • moved far away from the homes that they

  • used to stand next to.

  • Right now, while they're able to get closer, they still

  • cannot get into their homes.

  • And they don't know when they'll be able to because there's

  • still so much water in here.

  • And this is just one system where

  • the water is starting to recede, where

  • in others, it's still cresting.

  • So this is just a microcosm, a small picture

  • of what is happening throughout Nebraska

  • with these massive, devastating floods.

  • And I talked to one couple that has lived here

  • for several decades, over 30 years,

  • and asked them if they were going to rebuild.

  • And he said, we have nowhere else to go.

  • This is where we belong.

  • [MUSIC PLAYING]

  • [EXPLOSION]

  • - Whoa!

  • [SCREAMING]

  • [ALARM SOUNDING]

  • MICHAEL GARNETT: My entire apartment started shaking.

  • And there was a huge boom.

  • I was just terrified.

  • I had no idea what was happening.

  • CARL AZUZ: So if a meteor explodes

  • in the atmosphere and no one's around to hear it,

  • does it make a sound?

  • NASA says it did.

  • The fireball that blew up 16 miles over the Earth's surface

  • in December was the second most powerful one

  • to enter our atmosphere in 30 years,

  • according to the space agency.

  • So why wasn't this reported in December?

  • Because scientists just noticed it.

  • It was originally detected by military satellites

  • and reported to NASA afterward.

  • Why didn't pictures and video go viral on social media

  • like those of other fireballs do?

  • Because it happened over the Bering Sea

  • in a pretty remote part of the world.

  • And relatively few people noticed.

  • What exactly caused a blast that powerful?

  • A meteor that scientists say was probably a few meters across.

  • That's all it takes to release 173 kilotons of energy.

  • And for reference, one kiloton is equivalent to 1,000

  • pounds of TNT.

  • Should you be worried about another one?

  • Scientists say no.

  • Most fireball events are smaller.

  • There have already been five noteworthy explosions in 2019.

  • 10 second trivia.

  • Where would you be most likely to find

  • mycelium, a mass of filaments?

  • In granite, on a CT scanner, on body armor, or in fungi?

  • The vegetative part of a fungus is called mycelium.

  • A growing number of artists, furniture

  • makers, and even clothiers are using mushrooms to make stuff.

  • And a big provider of the material for this

  • is a New-York-based company called Ecovative.

  • It's a bio-materials organization that's

  • received millions of dollars in grant money

  • from the US government, in addition to private funds

  • from private investors.

  • It's worked on everything from building

  • materials to packaging, all based

  • on using part of the mushroom.

  • When it comes to shipping materials,

  • it's not always the perfect substitute for Styrofoam

  • or other plastics.

  • Ecovative's original mycelium foam

  • could be more expensive to use than traditional materials

  • for lightweight packages.

  • But its makers say it is better for the environment.

  • And it's changing the way people think about mushrooms.

  • [MUSIC PLAYING]

  • - Since the 1950s, humans have produced

  • over 9 billion tons of plastic.

  • Most of that is ending up in landfills

  • and could take centuries to decompose.

  • A miracle material found in nature

  • could be the key to reducing plastic waste.

  • It's called mycelium, and it comes from mushrooms.

  • EBEN BAYER: Mycelium is like the root structure of a mushroom.

  • You're used to seeing a mushroom above ground.

  • Mycelium is like the roots beneath it.

  • But no one had ever tried to use them to make materials.

  • - Eben Bayer is the CEO of Ecovative, a company that

  • has developed a way to grow mycelium

  • into specific shapes and sizes.

  • They start by taking organic plant waste

  • and mixing it with mycelium cells, which

  • act as a sort of natural glue.

  • EBEN BAYER: The mycelium grows through

  • and around those particles.

  • And it binds them together.

  • And you've got a grown product.

  • - Ecovative's mycelium products provide a natural alternative

  • to packaging materials made out of plastic and Styrofoam.

  • EBEN BAYER: But at the end of its useful life,

  • you can actually break it up, and you could

  • put it in your own garden.

  • So it's a nutrient, not a pollutant.

  • - Ecovative wants to take mycelium to the next level.

  • EBEN BAYER: Our current technical focus

  • is developing the next generation of mycelium

  • materials, from cell scaffolding,

  • to leather-like materials, and even meat replacements.

  • - AKA, mycelium bacon, which is still in its testing phases.

  • The company thinks mycelium could also

  • play a major role in construction and even

  • in regenerative medicine.

  • EBEN BAYER: It really has boundless possibilities.

  • And it comes from its ability to move from the micro scale

  • to the macro scale.

  • CARL AZUZ: An astrolabe found off the coast of Oman

  • in the Middle East has just been awarded

  • the title of world's oldest by Guinness World Records.

  • An astrolabe is an instrument that

  • was used for centuries to mark the positions

  • of the sun and stars.

  • They were first used by astronomers hundreds

  • of years BC.

  • And sailors used them in the Middle Ages

  • until astrolabes were replaced by sextants.

  • Today, just over 100 mariners astrolabes are

  • known to exist in the world.

  • But add this one to the tally.

  • About five years ago, divers found it

  • at a shipwreck site near Oman.

  • Researchers believe it was made between 1496 and 1501.

  • And it's thought to have been used by Portuguese navigator,

  • Vasco da Gama, who was the first European

  • to sail from Europe to India.

  • The astrolabe had to be kept in a freshwater bath for two years

  • to get all the salt off it.

  • A symbol of Portugal's royal coat of arms

  • helped scientists identify it.

  • They hope its discovery will help them

  • understand more about how ships navigated

  • in the 14th and 15th centuries.

  • [MUSIC PLAYING]

  • Heliskiing, using helicopters to reach remote places to ski

  • has been around for decades.

  • As far as we know, Zeppelin skiing,

  • using an airship to get out in the back country,

  • is pretty new.

  • These three Austrian skiers worked

  • on the idea for almost two years before it

  • became reality in February.

  • They needed cold temperatures, clear skies, and no wind.

  • They also needed to descend by rope to the alpine summit

  • they intended to ski.

  • Was it worth it?

  • You'd better dirigibelieve it.

  • Of course, there were a few blimps in the road.

  • Their path to success wasn't always Zeppelinear.

  • And it took a while before everything

  • was an airship shape.

  • Big dreams often have steep slopes

  • and obstacles to traverse.

  • But once theirs got off the ground,

  • despite the ropes that repelled them,

  • they all clearly had a descent time.

  • I'm Carl Azuz.

  • And we'll ski you later on CNN.

  • [THEME MUSIC]

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CNN 10|CNN學生新聞|2019年3月20日。 (CNN 10 | CNN Student News | March 20 2019)

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