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Science Quickly

Summer Meteor Showers, Short Summer Days and Ancient Arthropods

Science Quickly

Scientific American

Science

4.41.4K Ratings

🗓️ 28 July 2025

⏱️ 9 minutes

🧾️ Download transcript

Summary

If last Tuesday seemed to fly by, you can blame the rotation of Earth. Try to look up this week to see the Southern Delta Aquariids and the Alpha Capricornids meteor showers. Plus, we discuss FEMA cuts and ancient arthropods. Recommended reading: Texas Failed to Spend Millions in Federal Aid for Flood Protection https://www.scientificamerican.com/article/texas-failed-to-spend-federal-aid-for-flood-disaster-protection/  Leap Seconds May Be Abandoned by the World’s Timekeepers https://www.scientificamerican.com/article/leap-seconds-may-be-abandoned-by-the-worlds-timekeepers/ E-mail us at sciencequickly@sciam.com if you have any questions, comments or ideas for stories we should cover! Discover something new every day: subscribe to Scientific American and sign up for Today in Science, our daily newsletter.  Science Quickly is produced by Rachel Feltman, Fonda Mwangi, Kelso Harper and Jeff DelViscio. This episode was hosted by Rachel Feltman. Our show is fact-checked by Shayna Posses and Aaron Shattuck. The theme music was composed by Dominic Smith. Learn more about your ad choices. Visit megaphone.fm/adchoices

Transcript

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0:00.0

Why are businesses like HelloVet choosing Apple products and services?

0:05.1

So we started the business two years ago.

0:07.2

We had a few people who were used to PCs and this was their first foray into Macs.

0:12.5

But it's been super smooth getting everyone onto those devices and everyone seems really, really happy.

0:18.0

Find out how Mac can help you run and grow your business at apple.com forward slash

0:23.6

HelloVet.

0:29.0

Happy Monday, listeners.

0:30.7

For Scientific American Science Quickly, I'm Rachel Feldman.

0:34.4

It's been a while, but we're finally back with our usual science news roundup.

0:39.0

Let's catch up on some of the science news you might have missed in the last week or so.

0:44.8

If last Tuesdays seemed to just fly right by, that's probably because it was a little shorter than usual.

0:52.7

The International Earth Rotation and Reference System Service says that July 22nd was around 0.8 milliseconds short of the standard 24 hours.

1:03.0

That's slightly less dramatic than the almost 1.4 milliseconds that were missing from July 10th,

1:09.0

and scientists anticipate another ever so slightly truncated

1:13.1

day on August 5th. Now, while there were plenty of headlines about these missing fractions

1:19.1

of milliseconds, it's not actually news that the Earth's rotation varies in speed. The length

1:25.4

of a single rotation, also known as a day, is impacted by factors

1:30.1

like the movements of our planet's liquid core, variations in the jet stream, and the gravitational

1:35.9

pull of the moon. One 2024 study even suggested that melting polar ice has decreased Earth's

1:43.0

angular velocity enough to slow rotations down.

1:46.5

In fact, Earth's days have generally been trending longer, if you look back at the last few

1:51.5

billion years. Research suggests that at various points in the time before our species evolved,

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