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Joe Palca

Joe Palca is a science correspondent for NPR. Since joining NPR in 1992, Palca has covered a range of science topics — everything from biomedical research to astronomy. He is currently focused on the eponymous series, "Joe's Big Idea." Stories in the series explore the minds and motivations of scientists and inventors. Palca is also the founder of NPR Scicommers – A science communication collective.

Palca began his journalism career in television in 1982, working as a health producer for the CBS affiliate in Washington, DC. In 1986, he left television for a seven-year stint as a print journalist, first as the Washington news editor for Nature, and then as a senior correspondent for Science Magazine.

In October 2009, Palca took a six-month leave from NPR to become science writer in residence at The Huntington Library, Art Collections, and Botanical Gardens.

Palca has won numerous awards, including the National Academies Communications Award, the Science-in-Society Award of the National Association of Science Writers, the American Chemical Society's James T. Grady-James H. Stack Award for Interpreting Chemistry for the Public, the American Association for the Advancement of Science Journalism Prize, and the Victor Cohn Prize for Excellence in Medical Writing. In 2019, Palca was elected to the American Academy of Arts and Sciences for outstanding achievement in journalism.

With Flora Lichtman, Palca is the co-author of Annoying: The Science of What Bugs Us (Wiley, 2011).

He comes to journalism from a science background, having received a Ph.D. in psychology from the University of California at Santa Cruz, where he worked on human sleep physiology.

Typically, if you get a COVID-19 vaccine that requires two doses, you should get two of the same vaccine. Two Pfizer shots, or two Moderna shots. Not one and then the other.

But in the future, that could change, either by necessity or by design.

This idea of using two types of vaccines isn't a new concept. It's known as heterologous vaccination, although there's a more colloquial term.

It took many months and tens of thousands of volunteers to gather the data showing that the current crop of COVID-19 vaccines are safe and effective.

But what if new vaccines are needed to deal with dangerous variants of the coronavirus? Waiting months is not an attractive option.

So researchers are trying to come up with tests that can be performed using a blood sample that will determine not only whether a vaccine will work but also for how long.

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After making the first powered flight on another world, NASA's Mars 2020 mission has managed another key first that could pave the way for future astronauts by making breathable oxygen out of the wispy Martian air.

Updated April 19, 2021 at 7:29 AM ET

Orville and Wilbur would be proud.

NASA's Ingenuity helicopter has made the first powered flight on another planet, more than 117 years after the Wright brothers' historic flight on this planet.

The flight itself was modest. The 4-pound helicopter rose 10 feet in the air, hovered briefly and returned to the Martian surface. An image taken from the craft showed Ingenuity's shadow on the surface, and another from the Perseverance rover showed an airborne Ingenuity.

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I've spent 30 years trying to make complicated science understandable. Explaining how vaccines work can be especially tricky. Explaining the new technology used in COVID-19 vaccines can be trickier still.

So my heart filled with joy and delight when I saw Vick Krishna's TikTok explaining how the vaccines made by Pfizer-BioNTech and Moderna work. So simple. So straightforward. So well done.

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Researchers in England are deliberately exposing volunteers to the coronavirus that causes COVID-19. The goal is to speed up the development of new vaccines and treatments.

But exposing people to a potentially fatal disease with no particularly effective therapy strikes some as unnecessary, if not unethical.

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