2 April 2013
Last updated at 15:28
Article written by Mark Mardell
Mark Mardell
Presenter, The World This Weekend
Features
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Tragic lessons
What Connecticut can learn from Dunblane
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This is not a drill
Preparing students for a shooting
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Evil and forgiveness
Rod Dreher on the perils of living with free will
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Friendless gunman
A profile of 20-year-old Adam Lanza
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How it happened
How a gunman killed 27 at a primary school.