The "legally blind" 65-year-old woman who mountain bikes "along knifelike cliff edges where one false move would mean a 2,000-foot fall."

Profiled in the NYT, here: "At 65 and Legally Blind, ‘Sister Shred’ Has Never Met a Slope She Wouldn’t Ride/Kris Nordberg still loves rolling through rock gardens and shredding powder on her ski bike — sometimes, in a nun costume." 

She has pseudoxanthoma elasticum, a progressive genetic disorder, and "riding with her head turned to the side, she can use her peripheral vision to make out people ahead of her on the trail and shapes and colors."

When she encounters a particularly tricky section of a trail — for instance, a rock staircase with jagged boulders that could snag a front wheel and send a rider over a bike’s handlebars — she sometimes asks strangers for guidance. She carries a bright orange strap and politely asks other riders if they could use it to mark the path of least resistance.