One evening in April, driving home from a university function, I was stopped in freeway traffic caused by roadworks somewhere up ahead when I felt a massive jolt. The back of my head hit the headrest, then my head lurched forward and I felt something hit the inside of my forehead with a squishy blow. Then my head snapped back and slammed into the headrest a second time. I didn’t feel any pain at first, just a stunned sense of disruption.
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