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How does a smartwatch measure your heartbeat?

02:40

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February 10, 2024

There are two ways wearables measure a person's heartbeat: optical pulse measurement using light and a heart rate sensor that records the heart's electrical activity.

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Skip next section Similar stories from Global issues

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Nobel Prize in physics for 'machines that learn'

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DW's fact-check team debunks, explains and uses in-depth research techniques to separate fact from fiction.
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How India wants to (literally) fix e-waste

India is dealing with it’s e-waste problem with an old trick in new ways.
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More on Digital World from around the world

Where is Europe in the global AI race?

Can Europe catch up the US and China on the artificial intelligence front?
Digital WorldDecember 24, 202404:03 min

Fact check: The most bizarre fakes of 2024

From diapers in the election campaign, migrants allegedly eating pets and crickets in chocolate - none of this happened this year. Here are DW's picks of the strangest fakes from this year. 
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Bans, scams and demands: The future of tech — Shift

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DW's Top Story

Germany's Faeser says AfD shouldn't exploit Magdeburg attack

Five were killed and over 200 were injured when a car was driven through a Christmas market in Magdeburg, Germany.
PoliticsDecember 26, 2024

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PoliticsDecember 24, 202402:21 min

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PoliticsDecember 23, 2024

Security questions over Christmas market attack in Magdeburg

Law and JusticeDecember 22, 2024
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Africa

Nigeria marks Detty December amid economic woes

Nigeria marks Detty December amid economic woes

BusinessDecember 25, 202403:02 min
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Asia

Bangladesh seeks India's extradition of ousted PM

Bangladesh seeks India's extradition of ousted PM

PoliticsDecember 25, 202402:08 min
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Germany

Merkel nemesis Friedrich Merz aims to be German chancellor

Merkel nemesis Friedrich Merz aims to be German chancellor

PoliticsDecember 25, 2024
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Europe

Ukraine: How people are dealing with daily power cuts

Ukraine: How people are dealing with daily power cuts

ConflictsDecember 24, 202402:48 min
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Middle East

'Maximum pressure': What's in store for Iran in 2025?

'Maximum pressure': What's in store for Iran in 2025?

PoliticsDecember 25, 2024
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North America

Living in New York City with a disability

Living in New York City with a disability

EqualityDecember 24, 202407:25 min
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Latin America

Argentina: Homeless people receive Christmas charity

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PoliticsDecember 25, 202401:50 min
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