# Aerospace Science

The Microscopic Guardian: Seven Decades at the Heart of China’s Aviation Ambitions

This article profiles 96-year-old Yao Zhicheng, a legendary metallurgy expert at Shenyang Aircraft Corporation who has spent over 70 years ensuring the safety of China's fighter jets. Through his work in metallographic analysis and his refusal to retire, Yao has become a symbol of China's pursuit of aerospace self-reliance and precision engineering.