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Every smart lock now promises privacy. Can any of them keep it?

Three of the biggest home-security brands spent the autumn arguing about whose door is safest. We read the fine print so you do not have to.

Mathematicians will need years to check what the proof machine just wrote

A system produced a 400-page argument for an old conjecture overnight. Verifying it is now a human-sized problem.

The book app finally adds half-star and quarter-star ratings

After years of readers writing "3.75, rounded up" in their reviews, fractions are here.