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This is Scientific American 60-second science. I'm Emily Schweng. Oh. I'm Emily Schweng.

This is the sound of a neighborhood in Calcutta, India, in December 2016.

It was recorded by resident Sukhantama Jumdar.

Okay. recorded by residents Sukhantamajumdhar. And this is what that same neighborhood sounded like on April 1st of this year after the COVID-19 lockdown.

It's like a unique place in time that we have to document for the future, for sure.

Amandine Gask is a soundscape ecologist with the French National Research Institute for Sustainable Development.

She's supposed to be in the field, recording nocturnal sounds in southern France,

to evaluate the effect of light pollution on animals there.

Instead, she's at home, but she's still recording,

now from her balcony where normally she'd mostly be hearing traffic.

In my neighborhood, there's amphibians, like, I think it's frogs that are like in this

very located space in the neighborhood that's very, very loud.

So at night there's like the frog chorus and the morning you have the bird caresses.

And you also hear like sounds of people in the gardens, slight music in the back. It's very relaxing.

When the pandemic hit, Gask and three other colleagues put a call out to volunteers all over the

globe. Currently, roughly 300 people are recording one minute of outdoor sound every 10 minutes for what's become the

...