Today's first story concerns a vaccine and a virus, but breaking news, it's not coronavirus--at least not all by itself--we're talking about influenza.

Flu season in the United States, when catching the disease is more likely, is in the fall and winter.

That's according to the Centers for Disease Control, which says the peak, the worst part of flu season, is between December and February.

The flu vaccine is not the perfect solution.

The CDC says when it's a good match for the flu viruses that are actually going around, the vaccine is between 40 and 60 percent effective at keeping people from having to go to the doctor for flu symptoms.

In some years the vaccine is less effective because it's not a good match, and the shot itself can cause side effects like fever, nausea and muscle aches.

But health officials say it's the best way for people to reduce their chances of getting the flu and spreading the flu.

In a typical year, about 45 percent of Americans get the vaccine.

It's the same in Britain, but you don't need me to tell you this ain't a typical year.

And here's where things could get more complicated in 2020: initial flu symptoms look a lot like initial coronavirus symptoms.

Doctors say you should stay home with either disease, but coronavirus is believed to be more dangerous.

And only a COVID (COVID-19) test can determine whether someone has it or something else.

Those test results could take days to get, so experts say that coronavirus (COVID-19) and influenza spreading at the same time with similar symptoms could have a pretty big impact on the number of work days and school days people miss this fall.

Health care workers are also concerned that the two diseases combined could put a greater burden on the health care system.

We've got Dr. Sanjay Gupta in the house now to answer some frequently asked questions about flu in the time of coronavirus.

How can I safely get a flu vaccine in the middle of this pandemic?

A very fair question.

People want to maintain physical distance.

How do you still get a flu shot?

Well, luckily, many places around the country are offering drive-thru flu shots.

Many are offering curbside flu shots.

If you go to your local drugstore, some of them even offer the flu shots within the drug store while maintaining safety protocols.

I understand the desire for social distance, but I think it's also important to get a flu shot this year.

It's important to get one every year, but perhaps even more important this year because we're probably gonna have a convergence of both flu and coronavirus this fall.

So anything we can do to reduce flu I think is gonna be really important.

Will the flu vaccine protect me from coronavirus as well?

Unfortunately, no.

These are both considered respiratory viruses, and many of the symptoms could be very similar--a cough, a fever, a sore throat.

But unfortunately, the flu shot does not protect you against the coronavirus.

Can I get coronavirus and influenza at the same time?

The answer to this question appears to be yes, there's been a few studies on this now.

One large study actually looked at patients who with known coronavirus, and also examined their respiratory specimens to see if they had another respiratory virus and 25 percent of the time, roughly, they did.

This is yet another reason to make sure you get your flu vaccine this year.

What can I do to prevent getting the flu this year besides getting a flu vaccine?

Many of the same things we've been talking about for preventing coronavirus work to help prevent the flu.

In fact, because of some of these measures that have gone into place over the last few months, we have seen places where flu has also decreased.

Obviously, with coronavirus, you wear a mask, you try and keep physical distance, you're washing your hands as much as possible.

You're doing all the things to basically make it harder for this virus to jump from person to person.

The same things that work for coronavirus are also gonna help decrease the chances that you'll get the flu.

More than half of all the young adults in America are now living with their parents.

This is according to a new report by the Pew Research Center, an organization that looks at demographic trends and public opinion.

Pew defines young adults as people who are between 18 and 29 years old, and never before have 52 percent of them been recorded as living at home with at least one of their parents.

Historic data for this is incomplete.

It's possible that more young people were doing it during the height of the Great Depression in the 1930s.

But info on that doesn't exist.

The last time the recorded number was this high was in 1940, near the end of the Depression, when 48 percent of young adults were living with their parents.

Overall, though, this percentage has been increasing since 1960.

At that time it was a 29 percent.

By February of this year it had risen to 47 percent and by July it was at the record 52 percent.

So why the recent jump?

Probably because of the coronavirus pandemic, according to the report.

Pew Research says that young adults in particular have been hit hard by the shutdowns and closures and that they're more likely to move.

A senior economist at Zillow, a real estate information company, says because most 18 to 25 year olds tend to be renters this is having an effect on that market, with an increasing number of rental homes coming available.

10-second trivia!

Which of these cartoon characters first appeared in a short called the Mouse of Tomorrow in 1942: Mickey Mouse, Mighty Mouse, Jerry or Fievel?

Originally known as Super Mouse, the character that became Mighty Mouse made his debut in '42.

As far as television goes, Mighty Mouse hasn't been on the air in years but he has been in space, in a manner of speaking.

These have been called "mighty mice."

They're genetically modified mice that have twice the muscle mass of unaltered mice, and 40 of them were recently sent into space for a study on muscle mass.

Without the daily force of gravity, people and mice normally lose muscle.

NASA says in space flights lasting five to 11 days astronauts can lose as much as 20 percent of their muscle.

Those who spend months on the International Space Station regularly exercise to help prevent this loss.

But this kind of training might not be possible during long-term spaceflight.

So scientists have been experimenting with mighty mice to see if a drug could be produced one day that could help astronauts keep their muscle in a microgravity environment.

Of course, drugs, especially those related to maintaining or increasing muscle mass, have an array of unwanted side effects.

So researchers are looking to create treatments that avoid those and as far as the mice were concerned, the genetically altered ones were able to keep more of their muscle mass in space and recover it faster once they got back down to Earth.

Speaking of Earth, there've been some unusual weather patterns taking place in the United States this month.

We told you yesterday how Western heat waves have been worsening conditions for California's record wildfires, but move east to the Rocky Mountains and you see a very different picture taking shape.

Wind speeds of 99 miles per hour--that's a force of a category two hurricane--were recorded Tuesday in part of Utah.

CNN 10 Contributor Tyler Mauldin tells us how that's part of a dramatic temperature change for the region, Tyler ...

Carl, from record heat to record cold, a dramatic temperature swing has hit the country this week.

Temperatures above 100 degrees (Fahrenheit) were being felt from the Rocky Mountains to the West Coast Labor Day weekend.

But fall, if not winter-like air, is now moving down from Canada as the jet stream dives south.

It's cold front sweeping the country and dropping temperatures some 40 degrees below normal all the way into Texas.

Nowhere is this more pronounced than in Denver, Colorado.

Check this out.

On Saturday, Denver hit a record high of 101 degrees, followed by another record high of 97 degrees on Sunday, another day of 90 degree heat on Monday, then, get this, 35 degrees for a high on Tuesday.

That's a more-than-60-degree drop from the holiday weekend.

Of course, in 2020 fashion, this is also spawning a rare September winter storm for the Rocky Mountains,

More than eight inches of snow--yes, you heard that right--eight inches of snow could impact the Rockies, which are currently under winter weather alert.

Denver, according to its local National Weather Service office, doesn't typically see its first measurable snow until mid October.

The earliest measurable snowfall on record for the city was September 3rd 1961.

So, this is one of the earliest big snows on record for the Rockies.

It's not gonna last long.

Carl, temperatures are gonna rebound in the days to come.

It is, however, a sign that we're now transitioning out of the summer season.

In the 1980s, an avant-garde composer named John Cage wrote a musical piece entitled "As Slow As Possible."

To play it would take 639 years.

A church in Germany accepted that challenge in 2001 and if all goes according to plan, the performance will wrap up in 2640.

So why is this making news now?

Because just last weekend, the piece made its first chord change in seven years.

The next one won't happen until 2022.

It's definitely a piece for the ages with no sudden movements, but adagio? Critics would say "adagi-no," they'd rather "larg-go" do something different.

They "an-dante" wanna wait for something, that "adagi-slow."

Musical puns--they got a ring to them ya'll!

I'm Carl Azuz for CNN 10.

Soda Springs High School gets today's shoutout.

It's in Soda Springs, Idaho, and while I don't personally choose the schools we mention, they are picked from the most recent program on our YouTube site.