The Brief

More than 13,000 years ago, when an abundance of saber-toothed cats roamed the Los Angeles Basin, the giant mammal would hide in tall savanna grasses or behind juniper shrubs and stalk its prey.

“We think they were probably ambush predators,” says Emily Lindsey, associate curator and excavation site director at the La Brea Tar Pits museum and paleontology research site.

When it spotted its target — horses, camels, mammoths or other large animals known as megafauna — it would use its powerful forearms to leap out and pin down its prey.

Then, using its 8-inch-long curved canines — serrated like a steak knife — it would slice through a vein and let the animal bleed out.

“All of that information is based on research here because we have this incredible collection of more than 2,000 saber-toothed cats,” Lindsey says. “It’s really rare that we have the whole record. You don't usually get that in paleontology.”

L.A.'s climate past and future

The La Brea Tar Pits — home to more than 3.5 million Ice Age fossils — is one of the planet’s best-kept records of what it was like in the area we now know as Southern California over the last 60,000 years. It’s also the world’s only active urban fossil dig site.

Fossils found in the asphalt help paint the picture of the life that once flourished here during the Ice Age: saber-tooth cats, giant sloths, dire wolves, grizzly bears, bison as well as juniper and oak trees.

Emily Lindsey, an assistant curator at the LA Brea Tar Pits, places a fossil inside the fossil collection room.

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But it's not just telling the story of the region’s past. This collection of Ice Age fossils also helps scientists understand what led to the most massive extinction of megaspecies on Earth since dinosaurs, when droves of large mammals suddenly died as extreme heat, drought and large-scale wildfires overwhelmed the region.

And as we endure another period of significant environmental change, these fossils also offer a window into the future.

“There was this ‘ah ha’ moment for paleontologists,” Lindsey says. “We said: ‘Oh wait, we have a really unique insight on that story because we can actually look at these different windows of different habitats from different times and see how they respond to climate change in real time.”

It’s part of a growing field called paleoecology, which aims to use the knowledge of prehistoric ecosystems that fossils yield to predict how plants and animals will respond to environmental events now and in the future.

“The fact that we have particular species of plants, or insects, or birds, or rodents can tell us a lot about how hot or cold it was, how wet or dry it was, and how that environment changed through time,” Lindsey says.

This link between the end of the Ice Age and the global warming we’re experiencing now is a focus of the ongoing research at the Tar Pits. Particularly, scientists seek to use fossil data to make decisions about how to preserve biodiversity today.

“You can only get that by looking at the fossil record,” Lindsey says.

The tar pits

About 1,000 feet beneath the metropolis of L.A. sits the Salt Lake Oil Field.
(The Los Angeles Basin is the richest in terms of oil by unit volume on earth). That, paired with the abundance of earthquakes in the region, which create cracks and chasms in the earth, paves the way for the tar pits.

Tar pits — sticky, shallow pools of asphalt that seep up through cracks and fissures in the ground — are essentially naturally occurring preservation deposits. The asphalt is so sticky that when animals stepped into it — even enormous ones like the now extinct pre-Columbian mammoth — they got trapped and couldn't get out.

Inside Tar Pit 91, where research is currently being done.

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The result? Meticulously preserved fossils that have been embalmed in asphalt for tens of thousands of years without exposure to air.

“So we get phenomenal preservation not just of bones, but of leaves and wood, insects and shells,” Lindsey says. “That’s what’s allowed us to build up the richest record of Ice Age life anywhere.”

Researchers examine fossils discovered in the tar pits.

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Using the fossil record to inform conservation decisions

Studies from Tar Pits researchers suggest extreme heat, drought and large-scale wildfires might be at the root of the last major extinction event.

Last year, a study published by researchers there found that large-scale wildfires — possibly started by humans — wiped out many of the large Ice Age mammals. The research broke new ground in an ongoing scientific debate over what triggered the Earth’s last major extinction event.

It adds more evidence to the growing understanding that extreme heat, drought and wildfires can drastically change habitats, leading to species extinction.

“This is just one example of how we can use fossil data to inform conservation and land management decisions today,” Lindsey says.

In an ongoing partnership with the Nature Conservancy, La Brea Tar Pits is now developing a practitioner's guide for land managers, mapping out ways to use fossil data in environmental decision making.

“In other words: How do you use historical and paleontological data to help inform conservation and restoration work in urban areas?” Lindsey says. “This will help address that.”

"When planning for these types of projects, The Nature Conservancy sets goals using information from a variety of sources," says Sophie Parker, director of science for climate and land use at The Nature Conservancy. "Knowing what was present at a site at multiple timepoints in the past, including the more distant past, is useful because it gives us a broader perspective on how to craft our goals."

Asphalt can be observed flowing from the gated tar pits, allowing visitors to witness the phenomenon.

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The Tar Pits also dedicates a small section of the park as the “Pleistocene Garden,” which contains plants that grew at La Brea at different times in history found in the fossil record. With plans for a major re-landscaping of the park currently in the works, there is a focus to significantly expand plants in line with the paleontological science on the grounds.

“It’s a way to viscerally communicate that story but also bring back some of those plants and serve as seed banks and help support urban nature,” Lindsey says.

Sharing the climate story

Beyond the rich scientific research backed by tens of thousands of years of fossil data, Lindsey says the most important part of the work they do at this critical environmental moment is public education.

By presenting current climate research alongside Ice Age fossil data, the hope is that it will drive a deeper understanding of our environmental crisis and emphasize a dire conclusion: then, as now, climate changes and human activities can intersect to drive large scale extinctions.

It's all laid out for the public to see in the La Brea Tar Pits museum and across its grounds.

“To have a place in the third biggest city in North America where people can see an entire scientific process," says Lindsey, "that’s another very powerful thing.”

Remains of mammoths can be seen at the La Brea Tar Pits.

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There is one notable, but perhaps hopeful, difference between then and now, Lindsey says.

The climate change that occurred at the end of the Ice Age 13,000 years ago was purely related to the earth’s orbital cycles.

Today, it’s 100% us.

“Meaning we completely have the ability to stop it if we want to,” Lindsey says. “It’s just a matter of political and societal will. I hope this helps people understand that small human actions could push the ecosystem to a tipping point.”

Grand Prix Association of Long Beach president and CEO Jim Michaelian died on Saturday, just four weeks before the street race was scheduled to roar again along the city’s shoreline, association officials said. It was to be the last race he would oversee before passing the reins to incoming CEO Jim Liaw.

Michaelian was 83. His cause of death was not released.

Michaelian wore increasingly larger hats during the past 51 years of the annual race, serving first as the Grand Prix Association’s controller, chief operating officer and then being named president and CEO in December 2001.

“Jim didn’t just lead the Grand Prix — he lived it,” Mayor Rex Richardson said in a statement. ”His passion, warmth and dedication turned an event into a tradition, and a tradition into a source of pride for generations of Long Beach residents. Under his leadership, the Grand Prix became a global event and a defining part of Long Beach’s identity.”

Michaelian graduated from UCLA with a BS in Physics and an MBA. He was a competitive sports car racer for more than 25 years and competed in endurance events at tracks including Le Mans, Daytona, Nürburgring, Dubai and Sebring.

Penske Entertainment acquired the Grand Prix Association of Long Beach in November 2024.

Penske Corporation chairman Roger Penske reflected on Michaelian’s contributions.

“Jim was a leader of a small, passionate group who believed in the concept of bringing elite open-wheel competition to Long Beach in the 1970s, worked tirelessly to make it happen despite steep odds and then helped nurture the Grand Prix of Long Beach into becoming America’s premier street race,” Penske said. “His vision and energy surrounding this great event remained boundless for 50 years, as no task was too small for Jim, even while he served in numerous leadership roles.”

Michaelian is survived by his wife, Mary, and sons Bob and Mike.

“A loving and devoted husband, nothing meant more to Jim than his family,” the Grand Prix Association said in a statement. “He especially treasured the time he spent with his two boys, creating memories that will be carried forever.”

The Major League Baseball season kicks off this Wednesday, with the New York Yankees going up against the San Francisco Giants.

For our reigning world champs Dodgers, their home opener is on Thursday, when they play the Arizona Diamondbacks at Chavez Ravine.

This year, the Dodgers are looking to make history for the franchise with their pursuit of a back-to-back-to-back win. So, how are their chances? We take these questions to LAist's resident sports expert, Matt Dangelantonio.

How are the Dodgers looking this year?

In a word? Great. Almost the entire 2025 World Series team is returning, with a couple of major additions in the outfield and bullpen. The Dodgers are Vegas' favorites to win it all at +230, far ahead of the next team up — the New York Yankees at +1000. The Dodgers remain the team to beat in the National League West, and really in all of baseball. They are a blueprint for what can go right when you have a lot of money to spend and invest right.

The team's biggest assets?

Biggest assets are the names you already know: Ohtani, Freeman, Betts, Muncy, Teoscar, Yoshi ... the list goes on. There are also two new names folks will want to watch. One is slugging outfielder Kyle Tucker, to whom the Dodgers gave a four-year deal worth a whopping $240 million. He's a four-time All-Star who can hit 30 home runs, and is a strong defensive outfielder with a Gold Glove (2022) under his belt. One thing the Dodgers lacked last year was a de facto closer, though rookie Roki Sasaki took on that role during the postseason. Now, the Dodgers have a true closer in Edwin Diaz, a former New York Met with a proven track record of locking things down in the ninth inning — if he can stay healthy. The bullpen will also benefit from the return of past mainstays like Brusdar Graterol, Tanner Scott and Alex Vesia, who missed the World Series after the death of his newborn daughter.

The biggest concerns?

Age and health, pretty much the same as usual. Offensive woes caught up to some of the team's elder statesmen — like Freddie Freeman, Mookie Betts and Max Muncy — in the World Series, though Muncy did redeem himself with the clutch 7th-inning homer in Game 7 of the World Series to make it 3-2 and set the table for Miggy Ro's 9th-inning, game-tying homer. But those guys aren't getting any younger. Health was also an issue for the pitching staff in particular last year. Blake Snell and Tyler Glasnow both missed big chunks of time with injuries.

The archrivals?

In the NL West, it's the Padres as usual. They have a solid combination of veteran experience and youth in their lineup, a strong pitching rotation and arguably one of the best bullpens in baseball. The Mets and Phillies are likely to be the biggest potential threats to the Dodgers' reign, though both clubs have bad track records of winning when it matters. And then league-wide, the Yankees, Mariners and Blue Jays should all be very good and are each good bets to be on the opposite side should the Dodgers make it back to the World Series.

So, three-peat?

Nothing is certain in baseball, but what I'll say is ... it's their World Series to lose. I think in the eyes of owner Mark Walter and GM Andrew Friedman, anything short of a World Series win would be considered a failure, given how much money they've spent on their roster. They have absolutely no excuse not to make it back to the World Series this year if they stay healthy. They are in a unique position before the year even starts to be on cruise control through the regular season and really play their best baseball in October.

It's spring break season in the U.S. — and travelers are facing long airport lines as security screeners work without pay while the Department of Homeland security is shut down.

Congressional Democrats have declined to fund the agency in an attempt to force reforms of federal immigration enforcement practices.

Wait times at major hubs in Houston and Atlanta reached two hours on Friday, while New Orleans's Louis Armstrong International Airport advised passengers to arrive at least three hours before their scheduled departures. In Philadelphia, airport officials closed three security checkpoints entirely this week because of short staffing.

On Saturday, President Trump threatened to send Immigration and Customs Enforcement agents to staff airport security lanes if Democrats don't "immediately" agree to fund DHS. A bipartisan group of senators has been negotiating with the White House over immigration enforcement and ending the shutdown.

"I will move our brilliant and patriotic ICE Agents to the Airports where they will do Security like no one has ever seen before, including the immediate arrest of all Illegal Immigrants who have come into our Country," Trump posted on Truth Social. In a follow-up post he said he told ICE to "GET READY" to deploy to airports on Monday.

Why are wait times so long?

Officials say wait times are unpredictable and can fluctuate sharply as airports struggle with Transportation Security Administration staffing shortages.

TSA staffers are considered essential workers, so about 50,000 have been working without pay due to the shutdown that started Feb. 14. Last week, they missed their first full paychecks. The Department of Homeland Security says more than 300 TSA officers have quit. More than half of TSA staff in Houston called out sick and nearly a third called out in Atlanta and New Orleans last week, DHS said.

The staffing shortage comes as travel has also been disrupted by severe weather, and as schools across the country close for spring break.

Some 2.8 million people were projected to travel on U.S. airlines each day in March and April, adding up to a record 171 million passengers, according to the industry group Airlines for America.

What do officials say?

Transportation officials are warning the situation could get worse if the shutdown isn't resolved. A second missed paycheck would put even more strain on TSA workers, Transportation Secretary Sean Duffy told CNN on Friday.

"If a deal isn't cut, you're going to see what's happening today look like child's play," Duffy said. "Is it still safe as you go through the airport? Yes, but it takes a lot longer because we have less agents working." He added that some smaller airports may be forced to temporarily close if more staff calls out.

In the U.K., Foreign Office officials are also warning travelers of "travel disruption" caused by "longer than usual queues at some U.S. airports," and recommended passengers check with their travel provider, airport, or airline for guidance.

On Saturday, billionaire Elon Musk weighed in with an offer to personally pay TSA staff.

"I would like to offer to pay the salaries of TSA personnel during this funding impasse that is negatively affecting the lives of so many Americans at airports throughout the country," Musk posted on X early Saturday morning.

U.S. law generally bars government employees from receiving outside compensation for their work.

Even with disruptions, travel demand is still high

On top of long security wait times and weather impacts, travel is being affected by the war in Iran, which is driving up global oil prices.

On Friday, United Airlines said it would cut some flights over the next six months after jet fuel prices doubled in recent weeks. Capacity cuts are likely to send airfares even higher, even as ticket prices are already rising, said Clint Henderson, a spokesperson for the travel website The Points Guy.

Still, he said, none of that seems to be deterring Americans from flying.

"The appetite for travel is insatiable," he said. "People seem willing to endure a lot of stuff to travel. And I don't see any signs of that decreasing."

How can travelers prepare?

Travel experts say it's not just long wait times that travelers should prepare for — it's the uncertainty.

"Every day this goes on, it's getting worse and worse and worse," Henderson said.

Here are some tips on how to prepare for upcoming air travel:

1. Know before you go

Many airport websites list estimated security wait times. That should be the first place you check to get a sense of how long lines might be, Henderson says. (TSA also estimates wait times on its website and app, but that's not being regularly updated because of the shutdown, he added.)

"Knowledge is power," Henderson said. "You should know what's going on at your local airport."

He noted there are 20 U.S. airports where security screening is done by private contractors, not the TSA — and they are not experiencing staffing shortages or long waits. Some are smaller regional airports, but the list also includes some larger hubs, including San Francisco International Airport and Kansas City International Airport.

"There's big, big, big metropolitan areas where it's not an issue at all," Henderson said.

2. Budget extra time

If you're someone who shows up at the airport when your flight starts boarding, think twice, says travel writer Chris Dong.

"I'm the type of traveler who usually arrives pretty last minute," Dong said, "but I think that that advice would not be sound for the current situation."

Even if wait times are listed as short, things can change on a dime. Dong recently flew out of John F. Kennedy Airport in New York and found the TSA PreCheck line unexpectedly closed.

"So then everyone that was funneled through the regular line, it was an extra like 20, 30 minutes," he said. "I was sweating it out because I usually arrive super last-minute. And those levels of uncertainty are just higher now with the shutdown."

3. Consider biometric screening

Henderson typically recommends signing up for TSA PreCheck or the Global Entry program to move through airport security more quickly — and to opt in to biometric screening. That has to be done in advance, and travelers also have to choose biometric screening in their airline apps.

"Make sure if that's an option that you're opted in for that, because that will save you so much agita," he said.

For those who haven't signed up in advance, there is a last-minute alternative: the private CLEAR program, which allows people to enroll at the airport. Henderson notes it's pricey — annual membership costs $209 — but that some credit card companies will refund that fee.

"For me to skip a three-hour line is probably worth the membership fee, especially if you know your credit card will pay you back for it," he said.

That said, expedited screening lanes are not always faster than regular screening, both Henderson and Dong warned. Always check what all the lanes look like when you arrive at the airport.

4. Make a plan B

If you miss a connection or your flight is canceled, be proactive about rebooking. "Have all the tools available to you in the toolbox in case things go wrong," Henderson advises.

That includes installing your airline's app on your smartphone and writing down their customer service number, so you aren't scrambling to find it.

"And then, you know, obviously have a plan B," Henderson said. "Know what other airlines fly the route that you want to take in case, you know, you missed your Delta flight and American is offering a flight you can take later that day."

He says while airlines don't generally like to rebook passengers on competitors' flights, it's worth asking. He also recommends having the information at hand to give to customer service agents, including flight number, airline and departure time.

And if an airline cancels your flight in the U.S., you're entitled to a refund, according to the Department of Transportation.
Copyright 2026 NPR

Updated March 21, 2026 at 17:36 PM ET

Robert Mueller, the former FBI director and special counsel who led the high-profile investigation into Russian interference in the 2016 election and the possible obstruction of justice by President Trump, died on Friday at 81.

"With deep sadness, we are sharing the news that Bob passed away," his family said in a statement Saturday shared with NPR. No cause of death was given.

Mueller had been diagnosed with Parkinson's disease four years ago, his family told The New York Times in August.

Trump, who openly despised Mueller and his investigation, celebrated his death on Saturday.

"Good, I'm glad he's dead," the president posted on social media. "He can no longer hurt innocent people!"

WilmerHale, the law firm where Mueller served as a partner, remembered Mueller as a "friend" who was "an extraordinary leader and public servant and a person of the greatest integrity."

"His service to our country, including as a decorated officer in the Marine Corps, as FBI Director, and at the Department of Justice, was exemplary and inspiring," a spokesperson for WilmerHale told NPR in a statement. "We are deeply proud that he was our partner. Our thoughts are with Bob's family and loved ones during this time."

Former President Barack Obama on Saturday called Mueller "one of the finest directors in the history of the FBI, transforming the bureau after 9/11 and saving countless lives."

"But it was his relentless commitment to the rule of law and his unwavering belief in our bedrock values that made him one of the most respected public servants of our time," Obama wrote on social media. "Michelle and I send our condolences to Bob's family, and everyone who knew and admired him."

Path to public service

Born on Aug. 7, 1944 in New York City, Mueller was raised in Philadelphia and graduated from Princeton University in 1966. He received a master's degree in international relations from New York University.

Mueller, throughout his career, ran toward tough assignments. Following the lead of a classmate at Princeton, Mueller enrolled in the Marines and served in the Vietnam war. He earned the Bronze Star for rescuing a colleague. Mueller said he felt compelled to serve during that conflict, an idea he returned to throughout his life.

Law professor and former Justice Department lawyer Rory Little knew Mueller for many years.

"Bob is kind of a straight arrow, you know, wounded in Vietnam," Little said. "You keep wanting to hunt for where is the crack in that façade — 'Where is the real Bob Mueller?' — and after a while you begin to realize that's the real Bob Mueller. He is exactly who he appears to be. This kind of sour-faced, not a lot of humor, sort of all-business guy. That's him."

But with his closest friends, Mueller let down his guard. They teased him — saying Mueller would have made an excellent drill instructor on Parris Island, where Marine recruits are trained.

Instead, Mueller went to law school at the University of Virginia. He joined the Justice Department in 1976. There, he prosecuted crimes, big and small, for U.S. attorneys in San Francisco and Boston. He was a partner at Hale and Dorr, a Boston law firm now known as WilmerHale.

He later became a senior litigator prosecuting homicides at the U.S. attorney's office in Washington, D.C.

Head of the FBI

In 2001, President George W. Bush nominated him to serve as the director of the FBI. Mueller was sworn in a week before the Sept. 11 terrorist attacks.

"I had been a prosecutor before, so I anticipated spending time on public corruption cases and narcotics cases and bank robberies, and the like. And Sept. 11th changed all of that," Mueller told NPR during an interview in 2013.

He shifted the bureau's attention to fighting terrorism. He staffed up the headquarters in Washington. He pushed those agents to try to predict crimes and to act before another tragedy hit.

"He directed and implemented what is arguably the most significant changes in the FBI's 105-year history," said his former FBI deputy, John Pistole.

Along the way, Mueller drew some criticism when his agents erred. During the investigation of the deadly anthrax attacks, the bureau focused on the wrong man as its lead suspect.

Mueller left the bureau in 2013.

Return to the national spotlight

After Trump fired FBI Director James Comey, Mueller in May 2017 was appointed by then Deputy Attorney General Rod Rosenstein as special counsel to oversee the probe into Russian meddling in the 2016 election and possible connections to Trump associates.

Trump called the investigation "a witch hunt" and Republicans in Congress started to attack the investigators.

When then the investigation eventually concluded in March 2019 with the more than 400-page "Mueller report," the special counsel said the investigation did not establish that Trump's campaign or associates colluded with the Russian government to influence the 2016 election. The report did not take a position on whether Trump obstructed justice.

Mueller said the report spoke for itself. But Democrats wanted more and insisted he testify. A reluctant witness, Mueller once again fulfilled his duty. He was visibly older than at the time of his appointment and kept his testimony restrained.

He said Justice Department guidelines would not allow him to charge a sitting president with criminal wrongdoing. But he also refused to exonerate Trump.

"If we had had confidence that the president clearly did not commit a crime, we would have said so," Mueller later told Congress.

In the end, the team charged 37 people and entities, including former campaign chair Paul Manafort, national security adviser Michael Flynn and 25 Russians.

Trump went on to grant clemency to or back away from criminal cases against many of the people Mueller's investigators had charged.

Copyright 2026 NPR