Scientists finally solve the 100-year mystery behind tough tires

For nearly 100 years, reinforced rubber has powered everything from car tires to airplanes, yet scientists never fully understood why adding tiny particles of carbon black made rubber so incredibly strong. Now, researchers at the University of South Florida have finally cracked the mystery using massive computer simulations that took the equivalent of 15 years of computing time. They discovered that carbon black forces rubber to “fight against itself” when stretched, dramatically boosting its strength and durability.