In December 2014, Google introduced a reCAPTCHA checkbox that let many users skip distorted letters while the system weighed browser…
The little "I'm not a robot" tickbox looks like a formality, but behind it sits a behavioural analysis system that was quietly rebuilt more than a decade ago. The distorted letters faded because something better replaced them: watching the way a cursor arrives.
By How It Works · Sep 9, 2026
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Tech Explained
Wi-Fi signals struggle through walls not because concrete is thick, but because water in…
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Voyager 1 is now more than 25 billion kilometres from Earth, and its transmitter runs on…
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Tech Explained
How did a rubber gasket the size of a dinner plate, stiffened overnight in a Florida cold…
