Physics
Unbreakable: The MIT time-lock puzzle
A giant of internet cryptography has devised a code that he says will take 35 years to solve – with a mystery prize sealed in lead. MacGregor Campbell reports
Features
Physics
Super-accurate clocks emerge from ‘heat haze’
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Physics
Push to define year sparks time war
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Physics
Starting over: Let’s decimalise time
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Earth
Memory fails time-travelling chimps
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Your kitchen sink, and 16 other wonders of the cosmos
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Technology
Turn back time to deafen enemy divers
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Technology
Online photo coincidences betray your friends
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Technology
Mirror trick could boost Blu-ray discs
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Physics
How to cloak a crime in a beam of light
The 14th member of Danny Ocean's team of thieves might just be a physicist, making use of an "event cloak"
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Health
Formula for the perfect marathon carb load
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Environment
Have gene findings taken the stigma from ADHD?
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Health
Anti-antibiotics: Bugs, drugs and bureaucrats
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Physics
Countdown to oblivion: Why time itself could end
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