Apollo J-mission era — 2 museum-grade prints from the period. Apollo 15 opened the J-mission era — longer stays, better science instruments, and the LRV that let astronauts range kilometres from the LM instead of hundreds of metres. David Scott's hammer-and-feather demonstration, broadcast live from the Moon, became one of the most memorable physics lessons in history. Apollo 16 rewrote lunar geology textbooks — the Descartes highlands samples proved the region was impact breccia, not volcanic plains as pre-mission models predicted. John Young flew six missions across Gemini, Apollo, and Shuttle eras — more than any astronaut of his generation.