Fire amoebas, fossilized vomit and AI energy demands

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  Your heart can tell you a lot about your health.

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  Apple Watch Series 12 measures your heart rate every five seconds

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  with the most accurate heart rate sensing in a wearable.

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  So your vitals app, now with heart rate variability, can tell you when something is off.

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  And your readiness score can let you know when to rest and when to push.

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  Hear the story in every heartbeat with Apple Watch Series 12. The features

• 00:21

  described are for wellness purposes only and not for medical use.

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  IPhone 11 or later required.

• 00:25

  Based on Apple conducted study of heart rate accuracy,

• 00:26

  August 2026. Visit apple.com slash Apple Watch Series 12. This episode is brought to you by PayPal.

• 00:33

  You know how a mom's bag has everything?

• 00:35

  Sunscreen, snacks, a stapler?

• 00:41

  The new PayPal app is like that, but for your money.

• 00:43

  Shop, pay, manage your account, and earn rewards all in one place.

• 00:47

  And with purchase protection on eligible items, biometric security, and pass keys, you're protected at every step.

• 00:54

  Download the new PayPal app to get started.

• 00:56

  See paypal.com slash protection terms.

• 01:06

  Happy Monday, listeners.

• 01:08

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

• 01:11

  You're listening to our weekly science news roundup.

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