Modern aircraft wings often incorporate clever design features called "winglets" that point upward at the tips. These small but significant add-ons reduce vortex drag—a kind of turbulence that occurs at the wingtips during flight—resulting in improved fuel efficiency and reduced CO2 emissions. Surprisingly, the concept dates back to research by NASA in the 1970s. Today, winglets are a familiar sight on airliners, highlighting how small aerodynamic tweaks can have a substantial environmental and economic impact. What's your favorite aviation innovation? Share your insights!