Beulah Louise Henry was an American inventor whose creations—including the double chain stitch sewing machine, vacuum ice cream freezer, hair curler, double-ended umbrella and improved can opener—helped revolutionize manufacturing technology.
A naval engineer’s failed attempt to stabilize sensitive ship equipment accidentally sends a spring tumbling down a shelf, sparking the creation of the Slinky, a simple misfire that bounces its way into becoming one of the most beloved toys of all time.