Smartwatches can tell when you're stressed. They use a tiny sensor that measures your heartbeat, and they know how fast or slow it goes. When your heart is beating really quickly without any reason, like when you're nervous or worried, the watch knows something's going on inside you, and it says 'You might be stressed!'
Examples
- Your smartwatch beeps and says 'You're stressed!' just before your big presentation.
- It notices you're breathing faster during math class, even if no one else knows you're nervous.
- The watch detects that your heart is pounding more than usual right after a fight with a friend.
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See also
- How Did the First Computers Change Our Lives?
- How Did the First Computers Change the World?
- How Did the First ‘Computer’ Work and Why Was It Invented?
- How Did the First ‘Clocks’ Work Before Electricity?
- How Did the First Computers Actually Work?
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