A team of Danish researchers has discovered a way of dating dead bodies via the corpse's eye using a nuclear particle accelerator. The procedure, which measures the amount of a carbon isotope in the eye lens, has been made possible because of atomic weapons testing half a century ago. The technique only works for people born after 1950 and will only be valid until levels of the carbon isotype have returned to normal—probably 100 years. Here's how it works.

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