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CARL AZUZ: Today's edition of "CNN 10"

explains why our American viewers are a little more tired

than usual this Monday, and have they

have a little more evening daylight to look forward to.

I'm Carl Azuz.

First, the Democratic Republic of Congo,

a large country in central Africa,

is struggling with the second largest outbreak

of the Ebola virus ever.

There have been more than 900 cases in the DRC

since last August.

Ebola is highly contagious for people who've

had contact with the bodily fluids,

like blood of others who've had it.

It causes fever, severe headaches,

sometimes severe bleeding.

And despite the fact that an experimental vaccine is now

available, as well as new medications for Ebola patients,

574 people, more than half of those

who've contracted Ebola in this latest outbreak, have died.

Ongoing conflict in the Democratic Republic of Congo

only creates another problem for health workers

who are trying to stop the spread of the disease.

There are dozens of militias in the Northeastern DRC,

where this Ebola outbreak is.

Militants attacked a treatment center

on Saturday, killing a police officer

and wounding a medical worker.

And two attacks on Ebola clinics last month

forced the aid group Doctors Without Borders, to put

some of its efforts on hold.

Experts say some Congolese don't understand Ebola

and don't get treatment for it until it's too late.

"The New York Times" reports that there's sometimes distrust

of medical workers, and that Congolese don't want people

from other countries interfering with local funeral traditions.

All of these challenges together makes

it more difficult for health officials

to contain the disease and help those who've caught it.

Still, the outbreak that's killed hundreds in Africa's

second largest country, is a lot smaller than the one that

struck West Africa in 2014.

The World Health Organization says that outbreak

killed more than 11,000 people.

Our next story begins with a quote

concerning the US stock market.

"The bull market is showing signs of old age,

but it's not dead yet."

That was a CNN Business headline from August 19 of last year.

And the bull market it was talking about lives on.

Bulls and bears are used to symbolize

conditions on Wall Street.

A bull market is when prices are rising,

and it's one sign that the US economy is doing well.

How long will it last?

Well, there's a saying that bull markets and economic expansions

don't die of old age.

They don't just stop because they've

been going on a long time.

But if major stock indexes, like the Dow Jones Industrial

Average and the S&P 500, drop 20% or more

from their recent highs, we'll be

in what's called a bear market.

The question of whether that'll happen anytime soon

is something no one knows the answer to.

CHRISTINE ROMANS: It is the 10th birthday

of the current stock market bull run, the longest in history.

A bull rally born on a day when no one was celebrating.

March 9, 2009, when the Standard and Poor's 500 tanked to 676.

ZAIN VERJEE: Wolf, more devastating news for investors.

The Dow and the S&P are now down at new 12-year lows.

CHRISTINE ROMANS: From recession to recovery.

This is what it looks like.

The S&P 500 has more than quadrupled.

History made all along the way.

Stimulus, tax cuts, an auto bailout, a new health

care law, debt ceiling showdowns and a credit

downgrade of US debt.

A budget sequester and then, Democratic control giving

way to a GOP hold on Congress.

And ultimately, the White House.

More recently this.

The Trump rally, a 40% rise from Election Day to recent highs,

riding a wave of job creation.

Tax cuts and slashed regulations.

And once again, control of the House shifts back to Democrats.

The big question, the only question

is, will the bull live to see 11 years old?

The S&P 500 lost 6.2% in 2018, the worst showing

since the Great Recession.

And 2019 is a year with three big challenges.

Uncertainty about the global economy, particularly

in Europe and China.

Trade tensions between the US and China

have yet to be resolved.

And investors are worried about interest rates.

But the Federal Reserve has pivoted from scheduled rate

hikes to a more market-friendly approach of patience,

which could keep the life in the bull for a little bit longer.

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CARL AZUZ: 10 second trivia.

During what war did the US officially begin to observe

daylight-saving time?

American Revolution, War of 1812,

US Civil War or World War I?

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It was in 1918 during the First World War,

that the US followed Germany and then Britain in observing

daylight-saving time.

There's a bit of controversy surrounding who first

proposed daylight-saving time.

Some credit USA founding father, Ben

Franklin, when he wrote about a schedule switch in an essay.

A New Zealand entomologist named George Hudson

proposed a time shift in 1895.

And William Willett, the great-great grandfather

of Coldplay's lead singer, also gets

credit, as you're about to hear, for daylight-saving time.

But regardless of who's to thank or to blame for it,

it's been observed by several countries

since the First World War, and getting rid of it,

at least in the US, would take an act of Congress.

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JIM BOLDEN: This was a war where every hour counted.

On the battlefield and on the home front.

By 1916, an old idea had resurfaced,

one that was born in Britain near the home of time, the

Royal Observatory at Greenwich.

DR. LOUISE DEVOY: With the publication of a pamphlet

called "The Waste of Daylight."

And this was composed by a very entrepreneurial builder called

William Willett, who lived in Chislehurst, which is about 15

kilometers south of Greenwich.

And Willett was a keen horse rider,

and he used to go for early morning

rides in the local woods.

And it was on one of these rides he

noticed that all the blinds in the local houses were all down.

Everyone seemed to be in bed.

And as a very industrious and productive man,

he was appalled at this waste of time.

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- "Everyone appreciates the long light evenings.

Everyone laments their shrinkage as the days grow shorter.

And nearly everyone has given utterance to a regret

that the clear, bright light of early mornings

during spring and summer months is so seldom seen or used.

Now, if some of the hours of wasted sunlight

could be withdrawn from the beginning

and added to the end of the day, how many advantages

would be gained by all?"

JIM BOLDEN: Willetts died before he

saw his idea put into action, to save coal for the war effort.

But it was adopted at first by the Germans, not the British.

Postcards warn the population about the shift,

and why they owed it to their country not to forget.

The British followed a few weeks later and didn't miss a chance

for a dig at the Germans.

America came on board in 1918.

As DST spread around the world, countries adopted it,

dumped it or never tried it.

Still, the daylight debate rages every year.

The arguments exist whether it helps or harms

our health, and the economy.

While the wartime wisdom of saving energy

may no longer apply, for many of us,

the long summer evenings still endure.

The legacy of a war where so much was

lost to give us these freedoms.

Jim Bolden, CNN, London.

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CARL AZUZ: Package delivery by drone.

It could happen sooner than you think,

but probably not in the way you think.

This is what's currently being tested

by a few American companies.

Some of them even use self-driving technology.

They can carry heavier packages than flying drones,

and they won't get in trouble with the Federal

Aviation Administration.

Will they drop off your order sooner

and save delivery companies the expense

of that costly last mile?

We don't know yet if they'll be able to deliver.

They may be packed with features,

but to become part and parcel of delivery,

they'll need the backing of major companies

before they're bundled with a bundle

and cartoned off to make a drop off

without dropping off the tracking device

that orders them around.

A single accident could lead to a bad unboxing,

and that's a can of worms no company wants to open.

I'm Carl Azuz, shipping out another edition of "CNN 10.