I'm your host, Carl Azus.

Hope Your Tuesday is going well.

Airlines in several countries have decided to keep certain Boeing passenger planes on the ground.

Boeing is among the largest aerospace companies in the world.

One of its models currently flies with an engine made by another aerospace company, Pratt and Whitney.

And there was a major problem over the weekend with one of these planes powered by one of these engines.

On a United Airlines flight from Denver, Colorado, to Honolulu, Hawaii, there was an engine failure on Saturday afternoon.

Passengers aboard the plane and people on the ground heard a loud "boom".

The pilot immediately radioed a distress signal and turned the plane back toward Denver International Airport.

Despite the explosion and the debris that fell from the plane onto some populated areas of Denver, no one was hurt either on the aircraft or on the ground.

Several of the 241 people aboard the plane said they held hands and prayed, and after the flight landed safely back at the airport, people cheered before they got off the plane.

The aircraft was a Boeing 777; the engine was a Pratt and Whitney model 4000.

As US government investigators tried to find out exactly what went wrong, a source told CNN they believe a fan blade in the engine came off and destroyed another blade, leading to the failure.

The Federal Aviation Administration is recommending more frequent inspections of this specific engine, and several airlines in the United States, South Korea, and Japan are following Boeing's recommendation to ground dozens of these aircraft while the new safety measures are put in place.

There was a separate incident on Saturday involving a different Boeing aircraft powered by the same Pratt and Whitney engine.

One of these engines caught fire on a 747 cargo flight that was flying over the Netherlands.

That also happened shortly after take off.

The crew also made it back down safely, but the debris that fell from that plane did mildly injure two people on the ground.

Boeing has joined the US government in investigating what happened there.

Bad news and good news related to coronavirus cases in America.

First, the number of deaths in which COVID‑19 was cited as a factor has reached 500,000 since last winter.

The number of positive tests recorded in the US has surpassed 28 million.

But that's not a record of all cases, since many people who catch coronavirus have no symptoms and may not get tested.

The good news is that the number of new infections continues to drop in all but a few states.

It's the first time since last fall that the average number of new cases has been less than 65,000 per day.

Health officials don't know exactly why there's been such a decline.

Theories include the changing seasons.

Flu cases have historically decreased after February.

In some places, experts believe enough people have recovered from coronavirus and developed natural immunities to it.

Others say increased social distancing, mask wearing, and vaccinations are having an impact,

though not every health official agrees with that.

One thing they are warning about is that new variants, or mutated versions of coronavirus, could still increase its spread.

Viruses mutate naturally, and officials say coronavirus vaccines may not protect as well against variants.

I'm Isa Soares in London, where Prime Minister Boris Johnson set to unveil much anticipated road map out of lockdown.

The country has been in lockdown since January, and the prime minister, who wants to avoid a rise in hospitalizations and more pressure on the National Health Service, will be setting out to slow, cautious, and phased opening that he says will be guided by the data and not by dates.

The balancing act here is making sure that he doesn't open up too quickly, creating a breeding ground for new variants, putting, of course, pressure on a very successful vaccination program.

The expectation is that schools will open on March the 8th, followed by March 29th, when social gatherings will be allowed outdoors.

I'm Delia Gallagher in Rome.

Italy is marking one year since the discovery of its first case of coronavirus that happened in the tiny town of Codogno in northern Italy and triggered the first national lockdown in Europe.

Since then, Italy has had over 95,000 deaths from the virus, and Italians are still living under travel restrictions and curfews.

One thing has changed—Italy has a new prime minister, Mario Draghi, a well-respected economist.

And hopes are now pinned on him and his government to speed up the vaccine rollout plan and come up with an economic recovery plan for this country.

Ten Second Trivia!

Which of these construction projects was completed in 2011?

Beijing Daxing International Airport, International Space Station, One World Trade Center, or Burj Khalifa?

International Space Station was officially completed in 2011.

Of the 150 billion dollars it's taken to build the International Space Station, the United States has contributed about 100 billion, and it costs America about 3 to 4 billion dollars a year just to operate the orbiting laboratory.

That's part of the reason why NASA wants private companies to get involved there.

The ISS takes a significant chunk of the agency's budget, and NASA wants to focus more of its efforts in funding on Mars missions like Perseverance and on returning people to the moon.

For private astronauts to get to the ISS, the cost will be around 55 million dollars per seat.

The International Space Station represents the longest continuous human presence in low Earth orbit.

As a working laboratory, the astronauts are its researchers.

The amazing thing about the space station is that it's a place where we do research—we're simulating aspects of future space missions—and at the same time, we also have commercial providers that are coming in and becoming part of the space economy.

The space economy is, in many ways, the latest form of the space race.

Low Earth orbit—the space occupied by the ISS—is defined by NASA as the area and Earth's orbit close enough for easy transportation, resupply, and communication.

Low Earth orbit gives you access to a place where gravity is no longer a dominant force like it is on Earth.

It also is a place where you can potentially harness laws of physics in ways you can't on Earth to make products or other things that can't be produced here.

If you're gonna have an economy in space, you've gotta have supply and demand, and you have to have the research capabilities that a lot of small companies are now providing.

Some commercial companies like Space Tango, which facilitates manufacturing and research in microgravity, already have a presence on board the ISS.

While others have designs on starting their own.

On the ISS now government is, uh, the landlord, if you will.

We were on the platform with our... with our partners.

Um... that's not sustainable in the long run because we have exploration goals.

So we need to turn low Earth orbit over to the commercial sector, and then we become a customer in the last year.

So NASA has pivoted to starting to enable companies to learn that they can actually produce something in space.

NASA took a big step in that direction with the announcement that private astronauts with approved research projects can pay their way onto the ISS, and companies can bid to use a port on the station.

More and more, it seems, the human presence in low Earth orbit is set to expand in ways that we've never seen before.

Rachel Crane, CNN reporting.

According to moving.com, hiring professionals to move you to a new home costs anywhere from 1,000 to 5,000 dollars on average.

What about moving a home itself?

A 139-year-old Victorian resident measuring 80-feet long.

Developers wanted to put apartments in its old location, so the owner spent 400,000 dollars to have it towed six blocks.

(It's not every day you see a 139-year-old house move seven blocks)

(But that's exactly what happened in San Francisco)

(Spectators cheered as this two-story, historic Victorian was moved to a new location)

(It's the first move of its kind in 50 years, according to the San Francisco Historical Society)

(The fees and permissions alone reportedly cost the owner about $200,000)

(Squeezing the landmark building down the narrow roads took some prep work)

(Crew had to trim trees, move power lines and take down a few road signs)

(Eyewitnesses say the move was almost like watching a very slow Mardi Gras parade)

It was a moving sight.

They must have had to search high in bungalow to find the craftsmen needed for such a non-traditional relocation.

We don't know if they had a "tudor", but to get a house "Victorian" to its new home, you need more than mid-century modern ideas.

You need a revival of innovation so the project doesn't turn out raunchy.

That brings us home for the day on Carl Azus and I'm shouting out Walter McGuinness.

That's the name of a high school in Red Wing, Minnesota, where folks subscribed and left a comment on our YouTube channel.

CNN 10 returns tomorrow.