Warts
In 2002, a group of doctors compared duct tape's effectiveness with liquid nitrogen in removing warts. After two months of wearing duct tape daily and using a pumice stone about once a week to exfoliate the dead skin, eighty five percent of patients' warts were gone, whereas freezing only removed 60 percent. “The question is whether there is something in the chemical adhesive itself, or if the occlusion (suffocation) causes the destruction of the wart," says New York City-based dermatologist, Robin Blum, MD. "The other thinking is that the duct tape causes irritation, which stimulates our body's immune cells to attack the wart.
NASA
NASA used Duct tape to control Moon dust, make repairs to jet packs and most famously, in the construction of a makeshift device that let Command Module lithium hydroxide canisters be used with the LM Environmental Control System to prevent a buildup of carbon dioxide during Apollo 13. It was also used for such purposes as making a replacement fender for the Apollo 17 Rover, repairing Jim Irwin's broken OPS antenna on Apollo 15, and holding open the solar panels on the Apollo 17 SEP transmitter.
Travel
I was at Reagan International attempting to catch a connection on the other side of the airport my luggage the zipper gave way. Duct tape to the rescue.