My wife started wearing a helmet in April 2013 when someone was killed by the light rail along our bike-to-coffee route, about a quarter mile from the coffee shop. She bought a helmet on the way home after reading the news over the coffee.
Also: helmet thread!
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Genesis 49:16-17
"Well, well!" said Holmes, impatiently. "A good cyclist does not need a high road. The moor is intersected with paths and the moon is at the full."