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In this Thursday, May 13, 2021, file photo, a posted sign thanks visitors for wearing masks in Santa Monica, Calif.

CDC Reverses Course On Indoor Masks In Some Parts Of US

The new guidance follows recent decisions in Los Angeles and St. Louis to revert to indoor mask mandates amid a spike in COVID-19 cases and hospitalizations that have been especially bad in the South.

This undated file image provided by Merck & Co. shows their new antiviral medication molnupiravir. An experimental COVID-19 drug that could soon become the first U.S.-authorized pill to treat the coronavirus

FDA panel narrowly backs COVID-19 pill from Merck

It sets the stage for an expected authorization of the first pill that Americans could take at home for the coronavirus.

Estabrook talks with diet gurus and sifts through dieting history and the latest nutrition studies. He discovers that unfortunately, these diets don't really work in the long term for most people because they are too strict or require unnatural patterns of eating.

When Your Fad Diet Fails, And It Probably Will, 'Just Eat'

Diets often fail in the long term because they're too strict or require unnatural eating habits. In a new book, Barry Estabrook turns to science and history to find a weight-loss regimen that works.

Security personnel stand guard outside the Wuhan Institute of Virology during the February 3 visit of the World Health Organization team investigating the origins of the SARS-CoV-2, the virus that triggered a pandemic.

The Investigation Of The Pandemic's Origins Is At An Impasse

In the wake of heated debate over the unproven lab leak theory, the world is calling on China to cooperate with investigations. But efforts to delve into this matter seem to be stalling.

Scripps Institution of Oceanography Alumna and astronaut Megan McArthur, in blue flight suit, taken in Bldg. 5 Motion Based Simulator.

Scripps Institution of Oceanography Alumna Launches Into Space

Scripps Institution of Oceanography Alumna and astronaut, Megan McArthur, pilots into space as part of the NASA SpaceX Crew-2 mission to the International Space Station.

In this image from video provided by the Department of Defense, an unexplained object is seen at center as it soars high among the clouds, traveling against the wind. "There's a whole fleet of them," one naval aviator tells another, though only one indistinct object is shown.

Former Senator Urges More Study On UFOs

Former Democratic Senate majority leader Harry Reid told KPBS Midday Edition that he was disappointed with a recent report about UFOs from the Department of Defense.

In this file photo, Elizabeth Holmes walks into federal court in San Jose, Calif.

Elizabeth Holmes verdict: Former Theranos CEO is found guilty on 4 counts

Holmes, who was once seen as one of the most promising leaders in Silicon Valley, could spend up to 20 years in prison for defrauding investors of the blood-testing company.

In this March 16, 2012, file photo, researcher Terry Storm works in a stem cell research lab at the Lorry I. Lokey Stem Cell Research Building on the Stanford University campus in Palo Alto, Calif.

Prop. 14 Asks Voters To OK $5.5 Billion In Bonds For Additional Stem Cell Research

Supporters want the money to continue the science, but critics say the science didn’t do enough the first time.

FDA Permits Pfizer Vaccine For Children As Young As 12

The FDA has said that the COVID-19 vaccine made by Pfizer can be used in children as young as 12, expanding the number of people in the U.S. who qualify for the vaccine.

In this image taken by the Mars Perseverance rover and made available by NASA, the Mars Ingenuity helicopter, right, flies over the surface of the planet on Friday.

NASA Makes New Plans For Ingenuity Helicopter On Mars

NASA announced Friday that it would be increasing operational testing on its Ingenuity helicopter following four successful test flights off the surface of Mars.

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