The genius of feathers - can engineers replicate their design?

Despite ambitious attempts, scientists have never been able to fully replicate the evolutionary wonder of the feather. However, avian inspired design has inspired new technologies such as anti-turbulence systems for aircraft, bio-inspired adhesives, and even quieter wind turbines.

• GUEST: Aerospace engineer and biologist Professor David Lentink, based at the University of Groningen in the Netherlands. 
• PRODUCER: Ali Benton