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Mississippi had a problem born of the age of soaring student testing and digital technology. High school students taking the state's end-of-year exams were using cellphones to text one another the answers. Enlarge This Image Drew Angerer/The New York Times John Fremer, 71, a Caveon co-founder who was once the chief test developer for the SAT. CHEAT SHEET A High-Tech Approach Articles in this series examine cheating in education and efforts to stop it. Readers' Comments Readers shared their thoughts on this article. Read All Comments (77) » With more than 100,000 students tested, proctors could not watch everyone - not when some teenagers can text with their phones in their pockets. So the state called in a company that turns technology against the cheats: it analyzes answer sheets by computer and flags those with so many of the same questions wrong or right that the chances of random agreement are astronomically small. Copying is the almost certain explanation.

Can we prevent the use of mobile devices to cheat in exams?

How sports officials are using computer models to determine "maximum possible performance" for events like the Tour de France, based on variables including athletes VO2 max and our physiological knowledge of the human body. Athletes meeting or exceeding these limits are targeted for increased drug testing. *NEEDS SUBSCRIPTION* (or print edition)