John Green still has hope
Corrected on March 27, 2025
A previous version of this episode incorrectly said that tuberculosis was a virus. In fact, it is a bacterial disease.
NPR corrects significant errors in broadcast and online reports. Corrections of errors will be made in audio archives, written transcripts and on the website. To report an error, please use our corrections form.
A previous version of this episode incorrectly said that tuberculosis was a virus. In fact, it is a bacterial disease.
A previous version of this story incorrectly characterized Signal as a commercial organization. It is a non-profit.
This report incorrectly says that the Chesapeake Bay Bridge in Maryland is 17.6 miles long and is the fourth-longest bridge in the United States. It is approximately 4.3 miles long.
A previous version of this page misspelled Olivia Briley's last name as Bryly, Merritt Jacob's first name as Merrick and Max Freedman's last name as Friedman.
This story has been revised to clarify that while there are documented examples of people who produce sperm and viable eggs, there are no documented examples of people who produce both viable eggs and viable sperm.
In a previous version of this episode we incorrectly said that John F. Kennedy was the youngest president in US history. Kennedy at 43 was the youngest person to be elected president but Theodore Roosevelt, who took office at age 42 after William McKinley was assassinated, was the youngest person to serve as US president.
The House budget plan does not specifically include a proposal for eliminating taxes on tips, but Republicans hope to pass the policy as part of their broader legislative agenda.
In today's Up First, Tom Homan was incorrectly referred to as the homeland security czar. Homan is the Trump administration's border czar.
An earlier headline misspelled Marjorie Taylor Greene's last name as Green.
An earlier version of this story misspelled Marjorie Taylor Greene's last name as Green.
An earlier version of this story misspelled Marjorie Taylor Greene's last name as Green.
An earlier photo caption misspelled Marjorie Taylor Greene's last name as Green.
The casualty figure of 85 Palestinian journalists cited in this piece comes from the Committee to Protect Journalists. Israel has disputed that number arguing that some of those included in the count were not journalists and many were simply caught up in the war but not killed while actually working as journalists. (March 19, 2024)
An earlier version of a photo caption on this article misspelled Shaymaa Ahmed's name. It has been updated with the correct spelling. (Jan. 23, 2025)
An earlier version of a photo caption on this article misspelled Shaymaa Ahmed's name. It has been updated with the correct spelling.
In a previous version of this episode, we said that the research team used carbon-dated fossils to calibrate a molecular clock aimed at estimating the age of LUCA. In fact, the researchers used radio isotopic-dated fossils for that purpose.