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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

Similar stories from Global issues

Nobel Prize in physics for 'machines that learn'

John Hopfield and Geoffrey Hinton win for discoveries "that enable machine learning with artificial neural networks."
ScienceOctober 8, 202401:56 min

How DW's fact-checking team works

DW's fact-check team debunks, explains and uses in-depth research techniques to separate fact from fiction.
PoliticsMarch 18, 202410:37 min

How India wants to (literally) fix e-waste

India is dealing with it’s e-waste problem with an old trick in new ways.
TechnologyFebruary 16, 202413:07 min
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Skip next section More on Digital World from around the world

More on Digital World from around the world

Using tech to bypass censorship — Shift

Outsmarting censorship. Policing and AI. Using socia media as a tour guide – a good idea?
Digital WorldNovember 22, 202412:34 min

Google Chrome on the chopping block: What's the impact?

US regulators wants Google to sell its Chrome web browser, to counteract the company's market dominance.
Digital WorldNovember 21, 202402:55 min

How to circumvent online censorship

More and more states are restricting access to parts of the internet. But there are ways to get around such censorship.
Digital WorldNovember 15, 202404:28 min
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DW's Top Story

Life under occupation: 'Russians say they came to liberate'

A single border crossing from Belarus allows Ukrainians in Russian-occupied areas access to the rest of the country.
PoliticsNovember 23, 2024

Nordic countries ramp up civil defenses

ConflictsNovember 22, 2024

What is Russia's new 'Oreshnik' missile?

ConflictsNovember 22, 202402:35 min

Russia supplied anti-air missiles to North Korea, Seoul says

ConflictsNovember 22, 2024
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More stories from DW

Africa

People fleeing Sudan's war seek refuge in Chad

People fleeing Sudan's war seek refuge in Chad

PoliticsNovember 23, 2024
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Asia

Jailed activist tests India's anti-terror law

Jailed activist tests India's anti-terror law

Rule of LawNovember 23, 2024
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Germany

Germany begins major reform of its hospital sector

Germany begins major reform of its hospital sector

HealthNovember 22, 2024
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Europe

Hybrid warfare on the seabed?

Hybrid warfare on the seabed?

PoliticsNovember 22, 2024
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Middle East

Egypt: New asylum law could badly impact refugee rights

Egypt: New asylum law could badly impact refugee rights

PoliticsNovember 22, 2024
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North America

What impact could Trump have on US education?

What impact could Trump have on US education?

EducationNovember 22, 2024
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Latin America

Did Brazil's G20 summit deliver on its promises?

Did Brazil's G20 summit deliver on its promises?

TradeNovember 21, 2024
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