Why Your Watch Has So Many Sensors — and Why One Alone Is Never Enough
Why does your smartwatch need so many sensors? Explore how accelerometers, gyroscopes and optical sensors contribute different signals, how sensor fusion adds context, and why reliable results depe...
Why Your Watch’s Heart Rate Is Less Accurate on Darker Skin
Can skin tone influence your smartwatch’s heart rate readings? Learn how pigmentation can affect optical signals, why performance varies by device and activity, and what to look for in validation s...
How Your Watch Measures Stress — and Why It's Only Half Right
Your watch says “high stress,” but you feel calm—or the opposite. Discover how HRV and other sensor signals contribute to stress estimates, what can influence the results, and how to use trends as ...
How Does Sleep Tracking Actually Work? (Your Watch Can't See Your Brain)
How does your watch know you are asleep—and can it distinguish deep sleep from REM? Explore how movement and pulse patterns inform sleep estimates, why quiet wakefulness can confuse the algorithm, ...
Why Your Smartwatch's Calorie Count Is Probably Wrong？
Can you trust the calories burned on your smartwatch? Explore how devices estimate energy use, why results vary by activity and individual, and how to interpret the numbers without treating them as...
How Your Watch Knows You're Dreaming (And Why It's Probably Guessing)
You wake up, grab your phone, and there it is: a colourful bar chart of your night. Deep sleep here. REM there. A little awake time at 3 AM. Looks scientific. Looks precise. But here's the unc...