What do near-death experiences mean, and why do they fascinate us?
When Gregg Nome was 24 years old, he slipped into the churn beneath a waterfall and began to drown, his body pummelled against the sandy riverbed. What he saw there surprised him. Suddenly, his vision filled with crystal-clear scenes from his childhood, events he had mostly forgotten, and then moments from early adulthood. The memories, if that’s what they were, were vivid and crisp. Was he reliving them? Not quite. They came at high speed, almost all at once, in a wave. And yet he could process each one individually. In fact, he was able to perceive everything around him: the rush of the w...