An Ignoble Experiment: The 7: Trump and Biden’s border battle; the dangers of ultra-processed foods; a clue to life’s origin; and more

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Good morning. It's Friday, March 1, and we're catching up on why everyone's talking about Catherine, Princess of Wales. Now let's get to the news.

President Biden and Donald Trump each visited the southern U.S. border.

Why? Immigration is set to be a key issue in November's presidential election. Biden and Trump blamed each other for a surge in illegal crossings in dueling visits yesterday.
Today: A hearing will take place in the former president's classified documents case in Florida. The judge is expected to delay the trial from its scheduled May start.
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More than 100 people were killed at an aid delivery in Gaza City, officials said.

What happened? Palestinian officials and eyewitnesses blamed Israeli gunfire, while Israeli officials blamed a stampede near the convoy yesterday. Many details remain unclear.
The bigger picture: The Gaza Strip is on the brink of famine, humanitarian groups say, as the war's death toll rises. And negotiations for a temporary cease-fire are on rocky ground.

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Russian opposition leader Alexei Navalny is being buried in Moscow today.

Mourners gather around a hearse outside the Soothe My Sorrows church before the funeral service. (Reuters)

Who was he? Russian President Vladimir Putin's leading political opponent. The activist's widow, Yulia Navalnaya, has described his death in a Russian prison last month as "murder."
It could be chaotic: Riot police and security trucks have been deployed near the church and cemetery where services are taking place. Follow live updates here.

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Alabama passed legislation to protect IVF.

What to know: State lawmakers voted yesterday to shield patients and providers from legal liability if embryos created for the fertility treatment are damaged or destroyed.
Why they did it: The state's Supreme Court ruled last month that frozen embryos are children, which led to clinics halting treatment and an intense political backlash.
What now? Alabama's governor is expected to sign the finalized bill into law next week.

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The man accused of leaking classified intelligence on Discord will plead guilty.

A reminder: Jack Teixeira, a military computer technician, allegedly shared hundreds of secret documents on the chat platform, which is popular with gamers.
What's new? Teixeira, 22, plans to change his earlier plea of not guilty, a legal filing said yesterday. It could mean he'll get less prison time than if he had been found guilty at trial.

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Ultra-processed foods were linked to 32 health problems.

The details: Foods such as frozen dinners, sugary cereals and potato chips are linked to issues including heart disease, cancer, anxiety and early death, new research found.
What can you do? Learn how to identify ultra-processed food — here are some red flags — and stick to whole, fresh and homemade foods as much as you can.

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Scientists got a step closer to understanding the origin of life.

The finding could explain how lifeless molecules produced living and breathing organisms, from single-celled algae (shown here) to people. (Hakan Kvarnstrom/Science Photo Library)

How? For the first time, chemists created pantetheine — an essential building block of life — in a lab, using simple molecules that were probably present on early Earth.
Why it's exciting: It shows how chemical ingredients may have formed and combined to make living cells. And it suggests that, one day, scientists could create life from scratch.

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Before you go … what to watch this weekend: "Dune: Part Two" is in theaters — it has a brilliant cast and lots of sand. On FX and Hulu: "Shogun," a thrilling new drama.

And finally … end your week by playing On the Record, The Post's quotable quiz. The weekend version is 10 questions, and you can risk all your points on a final bonus question. Ready to play? Click here. Or try our word game, Keyword.

You're all caught up. See you Monday.