Vincent Acovino

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Over the past nearly two years, we've been remembering some of the almost 850,000 people who've died of COVID-19 in the U.S. And we've asked you to share their stories with us.

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On January 1, some 400,000 songs, speeches and sound effects entered the public domain. The sounds were all recorded before 1923 and include oddities like this.

(SOUNDBITE OF ARCHIVED RECORDING)

We've all had to deal with breakups — with close friends or romantic partners. But breakups aren't a uniquely human phenomenon. Our primate cousins do it too.

Robert Seyfarth, a primatologist at the University of Pennsylvania, says there are a number of ways a breakup can go down in a group of primates.

"We have known for years that primate groups, like baboons and other African monkeys and chimpanzees and gorillas, that they grow in size. And at a certain point, they may split apart," Seyfarth said.

Just like humans, groups of baboons sometimes break off relations. Scientists have studied the dynamics of such breakups and say baboons tend to split up in a cooperative, egalitarian way.

Brian A. Lerch et al, Better baboon breakups: collective decision theory of complex social network fissions

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For nearly a decade, scientists have been eavesdropping on killer whales in the Arctic.

(SOUNDBITE OF KILLER WHALES CALLING)

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The power grid in the U.S. is aging and already struggling to meet current demand. It faces a future with more people — people who drive more electric cars and heat homes with more electric furnaces.

Alice Hill says that's not even the biggest problem the country's electricity infrastructure faces.

"Everything that we've built, including the electric grid, assumed a stable climate," she says. "It looked to the extremes of the past — how high the seas got, how high the winds got, the heat."

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Over the past year and a half, we have been remembering some of the more than 750,000 people who have died of COVID-19 in the U.S., and we've asked you to share their stories with us.

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Now that the Food and Drug Administration has authorized Pfizer's vaccine for children ages 5 to 11, parents around the country are gearing up to get their kids vaccinated.

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The hit Netflix show "Squid Game" is a dystopian fantasy where the poor are pitted against one another in a series of childhood games with a life-or-death outcome.

(SOUNDBITE OF TV SHOW, "SQUID GAME")

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The celebrated TV show "The Sopranos" finished its six-season run in 2007. James Gandolfini was at the heart of the series, playing mob boss Tony Soprano in the New Jersey suburbs.

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The Hammond organ makes a singular jazz sound.

(SOUNDBITE OF LOU DONALDSON'S "ALLIGATOR BOGALOO")

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