One Night a Year, This Cactus Flower May Surprise You

By JOANNA KLEIN

A night-blooming cereus flower, which opens one night a year. Credit Pat Jarrett/The News Leader, via Associated Press

Rarely is it a good idea to respond to a stranger on a Brooklyn street at night when he asks if you want to see something cool. But occasionally, it pays off.Science
One Night a Year, This Cactus Flower May Surprise You…