That people will travel to Mars, and soon, is a widely accepted conviction within NASA. Rachel McCauley, until recently the acting deputy director of NASA’s Mars campaign, had, as of July, a punch list of 800 problems that must be solved before the first human mission launches. Many of these concern the mechanical difficulties of transporting people to a planet that is never closer than 33.9 million miles away; keeping them alive on poisonous soil in unbreathable air, bombarded by solar radiation and galactic cosmic rays, without access to immediate communication; and returning them safely to Earth, more than a year and half later. But McCauley does not doubt that NASA will overcome these challenges. What NASA does not yet know — what nobody can know — is whether humanity can overcome the psychological torment of Martian life.A mission known as CHAPEA, an experiment in which four ordinary people would enact, as closely as possible, the lives of Martian colonists for 378 days, sets out to answer that question.

President Biden used his State of the Union address last night to push for re-election and to go on the attack against Donald J. Trump, his likely adversary in November.Jim Tankersley, who covers economic policy at the White House for The Times, discusses the speech’s big moments.Guest: Jim Tankersley, who covers economic policy at the White House for The New York Times.Background reading: Biden made it clear that he saw the election as an existential struggle between democracy and extremism.Read five takeaways from the address.For more information on today’s episode, visit nytimes.com/thedaily. Transcripts of each episode will be made available by the next workday. 

When Google released Gemini, a new chatbot powered by artificial intelligence, it quickly faced a backlash — and unleashed a fierce debate about whether A.I. should be guided by social values, and if so, whose values they should be.Kevin Roose, a technology columnist for The Times and co-host of the podcast “Hard Fork,” explains.Guest: Kevin Roose, a technology columnist for The New York Times and co-host of the podcast “Hard Fork.”Background reading: Hard Fork: Gemini’s culture wars, and more.From Opinion: Should we fear the woke A.I.?For more information on today’s episode, visit nytimes.com/thedaily. Transcripts of each episode will be made available by the next workday. 

Millions of voters in states across the country cast their ballots in the presidential primary on Super Tuesday, leaving little doubt that the November election will be a rematch between President Biden and former President Donald J. Trump.But in a race that is increasingly inevitable, a New York Times/Siena College poll found a critical group of voters who are making the outcome of that race anything but certain.Nate Cohn, The Times’s chief political analyst, explains who these voters are and why they present a particular threat to Mr. Biden.Guest: Nate Cohn, the chief political analyst for The New York Times.Background reading: The big change between the 2020 and 2024 races: Biden is unpopular.The latest NYT/Siena College poll includes those who started the survey but didn’t finish it. Here’s why.For more information on today’s episode, visit nytimes.com/thedaily. Transcripts of each episode will be made available by the next workday.

Late last week, an effort to get food into northern Gaza turned deadly, as thousands of desperate Gazans descended on aid trucks, and Israeli troops tasked with guarding those trucks opened fire.Exactly how people died, and who was responsible, remains contested. Hiba Yazbek, a reporter-researcher in Jerusalem for The Times, explains what we know about what happened and what it tells us about hunger in Gaza.Guest: Hiba Yazbek, a reporter-researcher in Jerusalem for The New York Times.Background reading: Palestinian and Israeli officials offered differing accounts of a deadly scene in northern Gaza, in which local health officials said more than 100 people were killed.Delivering supplies into Gaza, especially the north, has taken on increased urgency as the United Nations has warned that many Gazans are on the edge of famine.For more information on today’s episode, visit nytimes.com/thedaily. Transcripts of each episode will be made available by the next workday.

A single piece of unverified intelligence became the centerpiece of a Republican attempt to impeach President Biden.Michael S. Schmidt, an investigative reporter for The Times, explains how that intelligence was harnessed for political ends, and what happened once it was discredited.Guest: Michael S. Schmidt, an investigative reporter for The New York Times, covering Washington.Background reading: Ignoring warnings, Republicans trumpeted a now-discredited allegation against President Biden.Analysis: An informant’s indictment undercuts Republicans’ impeachment drive.For more information on today’s episode, visit nytimes.com/thedaily. Transcripts of each episode will be made available by the next workday. 

At the end of a quiet, leafy street in the Valley in Los Angeles, the reality TV star Tom Sandoval has outfitted his home with landscaping lights that rotate in a spectrum of colors, mimicking the dance floor of a nightclub. The property is both his private residence and an occasional TV set for the Bravo reality show “Vanderpump Rules.” After a series of events that came to be known as “Scandoval,” paparazzi had been camped outside, but by the new year it was just one or two guys, and now they have mostly gone, too.“Scandoval” is the nickname for Sandoval’s affair with another cast member, which he had behind the backs of the show’s producers and his girlfriend of nine years. This wouldn’t be interesting or noteworthy except that in 2023, after being on the air for 10 seasons, “Vanderpump” was nominated for an Emmy for outstanding unstructured reality program, an honor that has never been bestowed on any of the network’s “Housewives” shows. It also became, by a key metric, the most-watched cable series in the advertiser-beloved demographic of 18- to 49-year-olds and brought in over 12.2 million viewers. This happened last spring, when Hollywood’s TV writers went on strike and cable TV was declared dead and our culture had already become so fractured that it was rare for anything — let alone an episode of television — to become a national event. And yet you probably heard about “Scandoval” even if you couldn’t care less about who these people are, exactly.As “Vanderpump” airs its 11th season, Tom Sandoval reflects on his new public persona.

President Biden and Donald J. Trump both made appearances at the southern border on Thursday as they addressed an issue that is shaping up to be one of the most important in the 2024 election: immigration.Zolan Kanno-Youngs, a White House correspondent for The Times, discusses Mr. Biden’s risky bid to take perhaps Trump’s biggest rallying point and use it against him.Guest: Zolan Kanno-Youngs, a White House correspondent for The New York Times.Background reading: In appearances some 300 miles apart, Mr. Biden and Mr. Trump tried to leverage a volatile policy dispute of the 2024 campaign.How visiting the border has become a potent form of political theater.For more information on today’s episode, visit nytimes.com/thedaily. Transcripts of each episode will be made available by the next workday.

A Times investigation has revealed how applesauce laced with high levels of lead sailed through a food safety system meant to protect American consumers, and poisoned hundreds of children across the U.S.Christina Jewett, who covers the Food and Drug Administration for The Times, talks about what she found.Guest: Christina Jewett, who covers the Food and Drug Administration for The New York Times.Background reading: Lead-tainted applesauce sailed through gaps in the food-safety system.What to know about lead exposure in children.For more information on today’s episode, visit nytimes.com/thedaily. Transcripts of each episode will be made available by the next workday.

U.S. officials have acknowledged a growing fear that Russia may be trying to put a nuclear weapon into orbit.Eric Lipton, an investigative reporter for The Times, explains that their real worry is that America could lose the battle for military supremacy in space.Guest: Eric Lipton, an investigative reporter for The New York Times.Background reading: The U.S. warned its allies that Russia could put a nuclear weapon into orbit this year.The Pentagon is in the early stages of a program to put constellations of smaller and cheaper satellites into orbit to counter space-based threats of the sort being developed by Russia and China.For more information on today’s episode, visit nytimes.com/thedaily. Transcripts of each episode will be made available by the next workday.