From the sleek hulls of racing yachts to Michael Phelps’ shaved legs, most objects that move through the water quickly are smooth. But researchers have found that bumpiness can sometimes be better.

Outside magazine, June 1995 Smooth-Sailing Crafts, By Land or By Sea On the car or in the water, boards and boats that are a breeze to handle By Nancy K. Crowell God does not deduct from a man’s life ...

From the sleek hulls of racing yachts to Michael Phelps' shaved legs, most objects that move through the water quickly are also smooth. But researchers from UCLA have found that bumpiness can ...